Every trade you will ever place is one of six instructions, and each instruction trades one certainty for another. This sheet organizes the platform's order types by intent — enter now, enter better, enter on a break, exit on failure, exit on target, follow the move — and gives each one a concrete scenario and its failure mode. The failure modes are not edge cases to memorize later; every order type has one, and knowing it is part of knowing the type.
Orders are instructions, not wishes
An order is a written instruction the platform executes mechanically when its condition is met. It carries no judgment, no flexibility, and no awareness of what you meant — which is precisely its value: the instruction executes the plan you wrote when you were calm, at a moment when you may not be. Choosing the right type starts from intent:
| Your intent | The instruction |
|---|---|
| Enter now, at whatever the market shows | Market order |
| Enter at a better price than now | Limit order — buy below, sell above |
| Enter when price breaks a level | Stop order — buy above, sell below |
| Exit if the trade fails | Stop-loss |
| Exit when the target is reached | Take-profit |
| Follow a move while protecting gains | Trailing stop |
Two housekeeping facts apply to every pending type before the details. A pending order is not a position: no margin is held and nothing is at risk until it fills, and it can be edited or cancelled freely until then. And every pending order carries an expiry — good-till-cancelled by default on most platforms, or a date you choose — which means an order you forgot you placed can become a position you never planned. A weekly sweep of the pending list is part of basic order hygiene.
Market order: certainty of fill, uncertainty of price
A market order says: fill me now, at the best available price. EUR/USD shows 1.0850 and you buy 1 lot — the position opens within moments, normally at or near the price you saw. The fill is certain; the exact price is not, because the market can move in the instant between your click and the execution. The difference is slippage, usually a fraction of a pip in calm hours on a major pair.
Failure mode: that fraction grows when markets move fast. Around a major news release, the price you clicked and the price you receive can differ by several pips — at $10 each on a standard lot — and the gap can fall in either direction. Immediacy is a real thing, and it has a price. The execution sheet in this survey measures it properly.
Limit and stop entries: price conditions, one scenario each
A limit order enters only at your price or better. Scenario: EUR/USD trades at 1.0850, and your analysis says a pullback to 1.0820 would be a better entry. A buy limit at 1.0820 waits; if price dips there, you are filled at 1.0820 or better, having paid nothing for the patience. Failure mode: price never comes. The pullback bottoms at 1.0824, turns, and runs 100 pips north while your order sits unfilled. A limit order is a bid for a better price at the risk of no trade at all — that is the deal, and there is no setting that removes it.
A stop order enters only on evidence of motion: buy above the market, sell below it. Scenario: EUR/USD has stalled under 1.0880 several times, and you want in only if that ceiling actually breaks — a buy stop at 1.0885 triggers when the market gets there and not before. Failure mode: the false break. Price touches 1.0885, fills you, and falls straight back — you bought the one print at the top. And because a stop entry becomes a market order when triggered, a fast break can fill you beyond your level, not at it.
Stop-loss and take-profit: the exit pair
A stop-loss closes the position when the market reaches the price that proves the idea wrong. A take-profit closes it at the target. Together they write both ends of the trade down before emotion gets a vote, and both can be attached to the entry ticket itself — which is where they belong. Worked symmetrically: buy 1 lot EUR/USD at 1.0850 with a stop-loss at 1.0810 and a take-profit at 1.0890, and the trade's two futures are −$400 and +$400, both chosen in advance, neither negotiated mid-trade.
The exit pair is also where position sizing begins. The distance to the stop-loss — 40 pips in the worked example — is the number that converts the money you are willing to risk into the lots you are allowed to trade, and the sizing sheets later in this survey build that arithmetic in full. Order types and position size are one decision wearing two interfaces: set the stop first, size from it second, and the exit pair stops being an accessory and becomes the frame of the trade.
Each side has small print. The stop-loss executes at the next available price once its level trades — in a normal market, your level or a whisker past it; across a weekend gap or a violent news move, potentially well beyond it. A stop is an instruction, not a guarantee, and the slippage sheet covers exactly when the difference shows up. The take-profit's failure mode is gentler but real: price can come within a fraction of a pip of your target and reverse, leaving a trade that was almost banked to ride all the way back. Neither flaw is an argument against the pair — trading without them is strictly worse — but both belong in the plan.
Trailing stop: what it solves, when it bites
A trailing stop is a stop-loss that follows the price at a fixed distance — never backward, only along. Set a 40-pip trail on the worked long from 1.0850: at 1.0900 the stop has walked up to 1.0860 and the trade is locked at worse-than-breakeven no longer; at 1.0950 it protects 1.0910. The problem it solves is honest and common: winning trades given fully back because no exit ever moved up behind them.
When it bites: ordinary noise. EUR/USD routinely breathes 40 pips against its own trend, which means a 40-pip trail converts a normal pullback into your exit — systematically, every time the pullback exceeds the trail. Trail too tight and you are stopped out of every winner early; trail loose enough to survive the noise and you give back most of what it was supposed to protect. The distance is a real decision, made from the pair's typical movement, not from how much giving-back feels comfortable. And a trailing stop remains a stop: the next-available-price small print applies to it unchanged.
Every type's failure mode, one line each
- Market order — filled for certain, but fast markets tax the price.
- Limit entry — the better price may never come; the planned trade silently doesn't happen.
- Stop entry — the false break: triggered at the level, reversed straight after, filled beyond it when the break is fast.
- Stop-loss — executes at the next available price; a gap can put that well past your level.
- Take-profit — missed by a fraction, then the move evaporates with the profit unbanked.
- Trailing stop — ordinary noise knocks you out of a working position when the trail is tighter than the pair's breathing.
Read the list again and notice what it is not: none of these are malfunctions. Each failure mode is the exact price of what the order type buys — immediacy, price improvement, confirmation, protection. Choosing an order type is choosing which certainty you need and which failure you can live with. The choice is honest work, and the platform cannot make it for you.
Stage money, real order engine. Set each type on a demo position and watch what fills, when, and at what price — before any of them is holding your money.