Online Trading: What It Is and How It Works

Trading is different from investing in its time horizon. Trading holds a position for seconds to weeks to profit from a price move, while investing holds an asset for years, usually in an investment account, for growth and for the income that ownership brings.

The horizon sets the frequency of decisions. A trader decides on every position, often several times a week, and watches the price while the position is open. An investor decides rarely, buys and holds for the long term, and lets years of growth and dividends do the work. The horizon also sets the direction. A trader can profit from a falling price by going short, while an investor gains only when the asset rises in value or pays income.

Trading often uses leverage, so a deposit controls a position several times its size. Investing usually pays the full price of the asset and owns it. An investor who owns a share receives its dividends, the share of profits a company pays to its shareholders, while a trader who holds a leveraged contract on the same share for two days receives only the change in its price. In return, trading has three advantages that investing lacks: the chance to profit in either direction, short holding times, and access to many markets from a single account.

Growth over years calls for investing, with the income that ownership brings. Profit from price moves in either direction calls for trading, at higher risk and with more of your time. Many people do both with separate money, and comparing trading and investing against your own goals decides how much of that money each activity gets.

Online trading is different from offline trading in how the order reaches the market. Offline, a phone call to a stockbroker or a floor trader carried the order, while online the trader sends it electronically from a platform or app. What did not change is that an authorised broker still stands between the trader and the market, and that the risk is the same.

In the UK, the change began on the London Stock Exchange with the Big Bang, the reforms that deregulated the City of London and ended fixed commissions on share deals. Share dealing moved from the trading floor to screens on 27 October 1986, and the floor emptied within months. Before the Big Bang, a private client phoned a stockbroker, the stockbroker passed the order to a dealer on the floor, and the price came back by phone. The screen reached private clients with the internet in the late 1990s, and their pocket with the smartphone. Online trading is also called electronic trading or e-trading.

Online trading brought the retail trader four advantages. Access: an account opens online, without a relationship with a stockbroker. Speed: an order reaches the market in a fraction of a second, and real-time prices update on a phone. Cost: the commission on a deal has fallen far below what a stockbroker charged by phone. Products and hours: a trading app offers shares, currencies, indices and commodities side by side, and quotes CFDs (contracts for difference, which follow a market's price without ownership of the asset) on many markets almost round the clock, well beyond the hours of any exchange.

The structure of a trade and its risk stayed the same. An authorised broker still holds the account and carries every order to the market, and a losing trade loses the same money whether the order went by phone in 1985 or by a tap on an app today. An app also makes it easier to trade more often, and trading more often is a risk of its own.

Trading without owning the asset differs from buying it in ownership. A share bought outright makes the buyer a shareholder, with shareholder rights and dividends, while a CFD on the same share pays the change in its price and gives none of those rights. In exchange, the CFD allows going short and trading with leverage, at the cost of overnight financing, and ownership allows neither.

Take ₦1,800,000 of exposure to one share. Bought outright, the share costs ₦1,800,000 plus the broker's commission, and the full amount leaves the account. Through a CFD with a 20% margin, which is leverage of 5:1, the same exposure needs ₦360,000 deposited. A 10% fall in the share costs ₦180,000 in both cases: for the owner, a tenth of the money invested; for the CFD trader, half of the deposit. Only the CFD trader could have sold first and gained ₦180,000 from the same fall.

The two routes also differ in costs, tax and protections. The owner pays the commission once, on the purchase, and no daily charge while holding the share. The CFD trader pays the spread and, for every night the position stays open, overnight financing, which makes a CFD expensive to hold for months. The two products are taxed differently, and the treatment depends on the country. A compensation scheme pays if the firm fails only where the regulator of the broker's company has one, as in the UK and the European Union, and no scheme pays for trading losses; a retail client's loss on leveraged products stops at the money in the account only if the broker's company grants negative balance protection: a company authorised by the FCA, an EU regulator or ASIC must grant it, while a company authorised in an offshore centre may not.

Holding for years calls for buying the asset. Trading short-term moves in either direction calls for a CFD, chosen with the knowledge that most retail accounts trading CFDs lose money.

Online trading goes through a broker because a retail client cannot deal on an exchange directly. An online broker is the authorised firm that opens the client's trading account, holds the money in it, provides the platform and executes each order, either by passing it to an exchange or by taking the other side of the trade as market maker.

Only member firms can deal on an exchange, and membership requires capital, systems and supervision that an individual does not have. The broker is authorised by the regulator of the company holding the account, which may be based abroad and whose rules are those that protect a retail client in Nigeria, and the authorisation is what allows the broker to hold retail clients' money and carry their orders. Opening an account starts with identity checks, known as KYC (know your customer), which the law requires against fraud and money laundering. The firm then keeps client money segregated from its own, in separate accounts, where the regulator of the firm's company requires it, so that the firm's creditors cannot claim it if the firm fails.

Execution follows one of two models, and each shapes the price the client gets. In the first, the broker passes the order to an exchange, and the client gets the exchange's price, usually plus a commission. In the second, the broker is the market maker. The broker quotes the price, takes the other side of the trade and earns from the spread, so the client's price is the broker's own quote, derived from the underlying market. Many firms run both models, shares through the exchange and CFDs as market maker, and even the best online brokers execute every order through one of the two.

Leverage works in a trade by letting a deposit, the margin, open a position many times larger, so that the broker computes profit and loss on the full position and not on the deposit. On a CFD on the NGX All-Share Index worth ₦18,000,000, a 5% margin means ₦900,000 deposited, which is leverage of 20:1. A 1% move in the index gains or loses ₦180,000, a fifth of the deposit.

Margin and leverage express the same ratio. A margin of 5% means a position 20 times the deposit, 20:1. A margin of 3.33% is 30:1, and a margin of 20% is 5:1. The broker lends the trader nothing to spend. Leverage is exposure, and the trader carries the gain or the loss on the whole ₦18,000,000.

With the NGX All-Share Index at 254,000, a spread of 20 points is about 0.0079% of the price, about ₦1,417 on a ₦18,000,000 position, and it comes off both outcomes. A 1% rise gains ₦180,000 and leaves ₦178,583 after the spread. A 1% fall loses ₦180,000 and costs ₦181,417 with the spread. A 5% move against the position takes ₦900,000, the whole deposit.

As losses eat into the account, the broker watches the equity, the deposit plus or minus the open result. When the equity runs short of the margin the position requires, a margin call warns the trader to add money or reduce the position, and if the equity keeps falling the broker closes positions before the account runs dry. The margin call and the close-out are the two safeguards built into how leverage works, and neither changes the arithmetic. Leverage itself has a limit in Nigeria through the regulator that authorised the broker's company, which sets the most a retail client may use: with a company authorised in an offshore centre, leverage is usually far higher, while a company of the same broker authorised by the FCA, an EU regulator or ASIC caps it at 30:1 on major currency pairs.

The four orders that open and close a trade are listed below.

• Market order: fills now, at the best price available, so a buy fills at the ask and a sell at the bid. The fill is certain and the price is not, and in a fast market the price can be worse than the one on the screen.
• Limit order: fills at the price you set or better, a buy at or below the limit and a sell at or above it. The price is certain and the fill is not, because the order never fills if the market never reaches the limit.
• Stop-loss order: closes the position when the price reaches a set loss level. A stop-loss is not guaranteed, because the order fills at the next available price when the price gaps through the level, overnight or on news. That price can be well beyond the level. Guaranteed stops close exactly at the level, and some brokers offer them for a premium.
• Take-profit order: closes the position when the price reaches the target, locking in the gain without the trader watching the screen.

Interpreting chart patterns in trading involves analysing the shape and context of price formations to infer what they suggest about future price direction. Traders interpret chart patterns in terms of who is in control (buyers or sellers), likely breakout direction, and potential price targets. Chart pattern interpretation is about understanding what the shape of price movement suggests regarding trend changes or continuations, and acting on those insights. Traders translate the visual pattern into a trading plan, where they identify a pattern, wait for completion/confirmation, and then enter and manage the trade by reading what the pattern implies for stop and target.

Chart pattern interpretation is a mix of technical guidelines and some art, since experience helps in distinguishing high-probability patterns from false ones and reading context (patterns in the context of larger trends or other signals). Traders get a feel for which patterns to trust and how aggressively to trade them with practice.

Volume behaviour is part of chart pattern interpretation. Many patterns are considered more reliable if accompanied by certain volume patterns. For example, in a head and shoulders, volume often is highest on the left shoulder and head, then diminishes, and spikes on the break of the neckline. A trader seeing volume spike on the neckline break interprets that as confirming heavy selling and thus a valid reversal. In a flag, declining volume during the flag formation and then increasing on breakout is a classic sign that the continuation is real. Many traders devote many hours of study to a perfect understanding of chart patterns in trading and their rules.

Interpreting candlestick patterns in trading involves analysing the shape and position of one or several candlesticks to infer the market's current sentiment and potential next moves. Traders look at where a candlestick pattern occurs (after an uptrend, downtrend, or in a consolidation) and what the pattern signifies about buyer-seller dynamics, then use that information to make trading decisions.

Candlestick pattern interpretation is about reading the story each pattern tells about who's winning between bulls and bears, and then making a probabilistic bet that this story will continue to unfold in the indicated direction. By combining knowledge of patterns (knowing the exact rules of the "shooting star", for example) with placement (it happened at a resistance level after a long rally), traders make decisions to buy, sell, or stand aside. Candlestick patterns distil a lot of price info into a compact signal. Traders anticipate short-term market moves and adjust their positions accordingly by interpreting candlestick patterns accurately, ideally with confirmation signals such as volume increases.

Candlestick patterns are interpreted within a broader market context, whether in an uptrend, downtrend, or range. In downtrends, patterns such as the Hammer or Morning Star suggest a bullish reversal, while in uptrends, formations like the Shooting Star or Evening Star warn of a potential top. Multi-candle patterns (for example, Bullish Engulfing or Bearish Engulfing) emphasise momentum shifts from sellers to buyers or vice versa.

Traders often seek confirmation through follow-up candles, volume analysis, or alignment with key support and resistance levels. Higher time frames (daily or weekly charts) typically lend more weight to these patterns than shorter intervals.

Yes, trading losses can exceed the amount invested on a leveraged position, because the loss grows with the full position and a price gap can carry it past the deposit before the broker's close-out acts. A retail client trading CFDs is protected by negative balance protection, which exists precisely because the loss can pass the deposit, and which stops the loss at the money in the account, only if the broker's company grants it: a company authorised by the FCA, an EU regulator or ASIC must grant it, while a company authorised in an offshore centre may not.

On a ₦18,000,000 position held with ₦900,000 of margin, a 5% fall takes the whole deposit. A 10% gap overnight takes ₦1,800,000, twice the deposit, whether it comes from a company's results or a political shock, and the broker's close-out cannot act at a price the market skipped. A stop-loss does not cap the loss in a gap either, because the stop fills at the next available price.

Negative balance protection moves the loss beyond zero from the client to the broker. When the account falls below zero, the broker writes off the negative balance. A retail client's loss on CFDs stops at the money in the account only if the broker's company grants negative balance protection. The protection belongs to retail clients only, and it covers the account, not a single trade, so the whole balance of the account can still be lost.

The risk of a trade is limited by three decisions the trader takes before entering it. The trader first decides the most the trade may lose. The trader then sets the exit at the price where the market proves the idea wrong. Last, the trader sizes the position so that the loss at that exit equals the amount decided. Position size therefore equals risk divided by the distance from entry to exit.

The loss of any trade is its size times the distance from the entry to the exit. The risk comes first, usually 0.5% to 1% of the account per trade. The exit comes next, at the price where the reason for the trade no longer holds. The size follows from the two. A wider stop means a smaller position, so the loss stays at the amount decided whatever the market.

A stop-loss order closes the position at the exit, except in a gap, where the order fills at the next available price. A target at least twice the distance to the stop makes each win worth at least two losses, so a trader who wins fewer than half of the trades can still come out ahead.

Limits above the single trade protect the account over a run of losses. Over such a run the account falls from its peak, and that fall is the drawdown. To cap the drawdown, a daily or weekly loss limit stops trading once the account has lost a set amount. A second limit is diversification, the spreading of risk across several positions and markets, which restricts how much one trade or one market can hurt the account. The limits on each trade and on the whole account together make up risk management.

A trading plan writes all of these limits down before the first trade: the markets, the reason to enter, the risk per trade, the stop and the target, and the loss limits. The common ways beginners lose money come from leaving these limits unset.

For a reader in Nigeria, online trading is regulated through the authorisation of the broker's company: the regulator that authorised the company holding the account sets its rules, keeps the register it is checked against and decides whether a compensation scheme covers its clients. Every firm that deals with retail clients in Nigeria must be authorised by the regulator of the company that holds the account, which may be based abroad, appear on that regulator's register with its firm reference number, keep client money segregated and apply that regulator's rules on leveraged products. If an authorised firm fails, a compensation scheme pays only where the regulator of the broker's company has one, as in the UK and the European Union, and no scheme pays for trading losses.

A firm that wants to deal with retail clients in Nigeria applies to the regulator named in the account agreement, which checks its capital, its systems and the people who run it before granting permission, and then supervises it. An authorised firm appears on the register of that regulator, its public database, with its firm reference number, its permissions, its address, its website and its phone number. Once authorised, the firm must keep client money in segregated accounts and apply the retail rules of that regulator on leveraged products. A compensation scheme is the backstop if the firm fails, but only where the regulator of the broker's company has one, as in the UK and the European Union. Where a scheme exists, it pays for money and investments the firm cannot return, and no scheme pays for losses made by trading.

The regulator named in the account agreement may also keep a warning list of firms that deal with clients without permission, and of clone firms, which copy the name, reference number or website of an authorised firm to take deposits from people who believe they are dealing with the real one.

The check before depositing takes a few minutes. Search the firm's name on the register of the regulator named in the account agreement, confirm that the firm reference number, the website and the phone number match the ones you were given, and search the warning list, where the regulator keeps one, for the same name. A firm that is not on the register, or whose details do not match, should receive no money. The check of the register and the warning list is the part of what trading regulation involves that falls to the reader rather than to the firm.

The four rules that limit leveraged trading for a retail client in Nigeria are those of the regulator of the broker's company, and they are listed below as they stand with a company authorised by the FCA, an EU regulator or ASIC and with a company authorised in an offshore centre.

• Leverage limits: on CFDs, a retail client of a company authorised by the FCA, an EU regulator or ASIC may use at most 30:1 on major currency pairs; 20:1 on non-major currency pairs, gold and major indices; 10:1 on other commodities and non-major indices; and 5:1 on individual shares, while with a company authorised in an offshore centre leverage is usually far higher. Crypto derivatives carry no leverage at all with a company authorised by the FCA, because retail clients cannot trade them.
• Margin close-out: a company authorised by the FCA, an EU regulator or ASIC must close a retail client's positions when the equity falls to 50% of the margin the open positions require, while a company authorised in an offshore centre closes them at the level its own terms set.
• Negative balance protection: a retail client's loss on CFDs stops at the money in the account, and the firm absorbs any balance below zero, only if the broker's company grants negative balance protection: a company authorised by the FCA, an EU regulator or ASIC must grant it, while a company authorised in an offshore centre may not.
• Crypto derivatives: a company authorised by the FCA does not sell them to retail clients, a company authorised by an EU regulator or ASIC sells them with a low leverage cap, and a company authorised in an offshore centre may sell them with high leverage.

The table below gives the four protections, compared between a company authorised by the FCA, an EU regulator or ASIC and a company authorised in an offshore centre.

These protections come from the company, not from the country. A reader in Nigeria who opens the account with a company of the broker authorised by the FCA, an EU regulator or ASIC, if the broker allows it, gets them as a retail client; with a company authorised in an offshore centre, the protections are only those its terms grant. A client classified as professional gives them up even with a regulated company, and can lose more than the deposit and owe the difference to the firm.

Trading in Nigeria is taxed on its gains under the Nigeria Tax Act 2025, and no account shelters trading from tax.

No account in Nigeria shelters investments bought outright from tax, although gains on shares of Nigerian companies are excluded when the proceeds stay under NGN 150 million and the gain is up to NGN 10 million in 12 months.

An investor holds shares in a securities account, and two taxes can apply. Gains on selling shares and gains on CFDs are taxed differently under the Nigeria Tax Act 2025. Dividends received are taxed under a final withholding tax of 10%. Buying shares also carries a stamp duty of 0.08% of the value of the trade on the purchase, while CFDs carry none, because no share changes hands. The Nigeria Revenue Service (NRS) sets these rules, and their effect depends on personal circumstances and can change.

The table below gives two routes to a market, compared on their form, the tax on their returns and the stamp duty they carry.

Owning for years and speculating are separated by the taxes of Nigeria. Speculating with CFDs is taxed on its gains under the Nigeria Tax Act 2025.

Yes, it is possible to start trading with little money, because there is no fixed minimum. The budget is the most you accept to lose, and at a risk of 1% per trade an account of ₦180,000 risks ₦1,800 on each trade and an account of ₦900,000 risks ₦9,000.

The right amount is decided by the budget, not by the broker's minimum deposit. The budget is the sum you can lose entirely without real distress, after the emergency fund is in place, and ₦180,000 is enough to place trades at 1% of risk as long as the position size follows from the stop.

At ₦1,800 of risk per trade, the gains are small too, and the temptation is to raise the leverage to make the account grow faster, which turns a small budget into a fast loss. The risk per trade stays the same fraction of the account whatever the size of the account.

A demo account costs nothing, so the practice that comes before the first deposit needs no money at all.

The seven steps that set up a first trade are listed below.

1. Pick the market and the reason: choose one liquid market and write down why you expect it to move. In the example, the market is a CFD on the NGX All-Share Index, quoted at 253,980 / 254,000, the reason is a view that the index will rise, and the account holds ₦3,600,000 of money that is truly spare.
2. Decide the risk: fix the most the trade may lose before anything else. At 1% of the account, the risk is ₦36,000.
3. Set the stop-loss and the target: place the exit where the reason no longer holds, and the target at least twice as far from the entry. The stop-loss goes at 253,400, 600 points below the entry price of 254,000, and the target at 255,200, 1,200 points above it.
4. Size the position: divide the risk by the distance to the stop. ₦36,000 ÷ 600 points gives ₦60 per point, a position worth ₦15,240,000 with the index at 254,000, and at a 5% margin (20:1) the deposit is ₦762,000.
5. Place the order: buy with a market order, which fills at the ask of 254,000, and attach the stop-loss and the take-profit to it. The position opens 20 points down, ₦1,200, because it would close at the bid of 253,980. The spread is inside both results, since the trade opens at the ask and closes at the bid.
6. Manage and close: leave the orders to work and do not move the stop-loss. If the bid reaches the target of 255,200, the position closes 1,200 points up, a gain of ₦72,000. If the bid reaches the stop of 253,400, the position closes 600 points down, a loss of ₦36,000, the risk decided first. Held overnight, the position pays financing of about ₦10,543 a night at a 25.25% annual rate (₦15,240,000 × 25.25% ÷ 365), and the firm's published rate decides the real figure. A gap through 253,400 fills the stop at a worse price, and the loss then exceeds ₦36,000.
7. Record the trade: write down the reason, the risk, the entry, the exit, the result, the costs and any rule you broke, before the next trade.

Yes, online trading is open to any adult who passes the broker's checks. The checks are proof of identity and address, the age of majority, and, where the regulator of the broker's company requires it, an appropriateness test before leveraged products. Trading one's own money needs no licence.

The identity and address checks are a legal requirement against fraud and money laundering, met with an identity document and a recent proof of address. The appropriateness test, where the regulator of the broker's company requires it, asks about your knowledge and experience of leveraged products before the broker lets you trade them, and a broker that judges a product not appropriate for you has to warn you. The same checks apply to a student, who can open an account like any other adult.

In Nigeria, a person who trades their own money needs no licence, and the broker runs the checks that the regulator of its company requires before leveraged products.

No, trading is not like gambling by design, because a trade has a known cost, the spread, and a loss capped by position size and a stop-loss, while a bet faces odds set by a bookmaker. Without a tested method, a fixed risk and costs under control, trading behaves like gambling.

A bookmaker sets the odds of a bet so that the bookmaker profits across all bets, and the bettor loses the whole stake on a losing bet. A trade's cost is the spread, and the trader knows that cost before placing the order and sets the loss through the position size and the stop-loss. Over many trades, a tested method and a risk fixed in advance give the result a structure that a bet does not have.

A trader who enters on a hunch, raises the size after a loss and ignores the costs is placing bets through a trading platform.

Binary options are the trading product most often compared to gambling. Binary options work like a bet and are banned for retail clients in many countries, the UK included.

For someone with a history of problem gambling, trading can trigger the same behaviour, the chase of a loss and the pull of the next position, and that history is a reason to stay away from trading altogether.

The six common trading mistakes are listed below.

• Overtrading: opening positions without a real reason, out of boredom or the wish to be in the market, so that costs pile up and each decision gets less thought.
• Chasing losses: raising the size to win back a loss, which turns one losing trade into a larger loss.
• Moving the stop-loss: widening the stop as the price approaches it, so that the loss decided before the trade grows into one the trader never planned.
• Abandoning the plan: dropping the rules after one loss or a short losing run, when a run of losses is a normal part of any method.
• Ignoring costs: watching the price move and not the spread, the commission and the overnight financing, which decide whether a small gain is a gain at all.
• Skipping the record: trading without writing anything down, which leaves no way to learn what works and what does not.

The five steps of a trading performance review are listed below.

1. Log every trade: write down the setup, the plan, the result, the costs and any rule broken in a trading journal, at the moment the trade closes.
2. Review weekly: read the week's trades together, on a fixed day, away from the hours the market is open.
3. Read the figures: calculate the win rate, the average win against the average loss, the costs paid and the number of rule breaks.
4. Change one rule at a time: adjust the distance of the stop, or the market traded, so that the following weeks show its effect.
5. Judge on many trades: draw conclusions from dozens of trades, not from one week, because past results describe what happened and do not predict what comes next.

The six common myths about trading are listed below.

• The 90-90-90 rule: the claim that 90% of new traders lose 90% of their money in 90 days has no source behind it. The measured figure is the share of retail accounts that lose money, which firms offering CFDs in the UK and the European Union publish and update every quarter.
• Trading as a salary: a salary arrives every month, and trading results do not. Losing months are part of every method, while the trader pays the costs of trading and of living in all of them.
• Winning most trades: profit does not require being right most of the time. A trader who wins 40% of trades can be profitable if the wins are larger than the losses: with wins twice the size of the losses, four wins in ten leave the account ahead before costs.
• More trades, more profit: the evidence points the other way. Barber and Odean found that the households that traded most earned the least, because each extra trade added costs and few added returns.
• Past results as proof: a run of winning trades, a strategy's record or a screenshot of someone else's profits does not show what the next trades will do. Past performance is not a reliable indicator of future results.
• Leverage as extra money: leverage is exposure, not money. A deposit of ₦900,000 at 20:1 controls a position of ₦18,000,000, and the loss on that position is the trader's own.