Order types
You've decided to buy. Good. But "buy" isn't one button — it's a small menu of ways to buy, and the one you pick quietly decides which risk you're taking. Choose wrong and a perfectly good idea still loses money.
There are only three order types you actually need, and each one is a trade-off: it hands you one guarantee and takes away another. Knowing which is which is the difference between an order that helps your plan and one that sabotages it.
A market order says: "fill me right now, at whatever price is available." From last lesson, that means you take the best ask when buying or the best bid when selling. It's instant and it always executes — but you don't control the price you get.
A limit order says the opposite: "fill me only at this price or better, and if you can't, don't fill me at all." A buy limit at $49.50 will pay $49.50 or less, never more. It rests in the order book and waits. You control the price exactly — but you're not guaranteed to trade at all, because the market may simply never come to your number.
A stop order is a sleeper. It does nothing until the price touches a level you set — the trigger — and at that moment it wakes up and becomes a market order. Its main job is protection: a stop-loss sits below your buy and automatically sells you out if the trade goes wrong, so a small loss can't quietly become a catastrophe while you're away. (This one order is so important that all of Module 6 is built around it.)
Line them up by what they promise and what they don't, and the shape of each risk becomes obvious:
what each order guarantees — and how it bites
The pattern is clean once you see it. A market order is about certainty of getting in or out — use it when being in the trade matters more than a penny of price. A limit order is about precision — use it when the exact price matters more than the guarantee of a fill, like patiently waiting for a pullback to your level. And a stop is about automation — it enforces a decision you already made, especially the decision to cut a loss, even when you're not watching.
The trap is believing a stop-loss is a guaranteed exit price. It isn't. A stop only guarantees that once triggered, it turns into a market order — and a market order fills at whatever's available. If the price gaps or the market moves violently, your stop set at $49 can fill well below $49. It caps your risk in normal conditions, not in a crash.
The other two bite in their own ways. Market orders bleed you through slippage on thin or fast-moving stocks — exactly the spread problem from last lesson. Limit orders tempt you to sit stubbornly at a price the market blows past, so you watch a winner run off without you, then chase it late. Every order is a tool with a sharp edge; there is no free "just fill me perfectly" button.
For the swing trading this course teaches, a simple, safe default covers almost everything: use limit orders to enter so you never overpay chasing a price, and always pair a position with a stop-loss so a bad trade can't run away from you. Market orders are fine for getting out fast when it truly matters. That's it — three tools, used on purpose, not by reflex.
Open the Lab and feel the difference directly. First place a limit buy a little below the current price and just watch it sit there, unfilled, until price dips to it — that patience is the whole point of a limit. Then, on your next entry, attach a stop-loss a bit below your buy and let the replay run.
If the trade turns against you, watch the stop do its job automatically — no panic, no decision needed in the moment, because you made the decision in advance. That "set it and let it protect me" feeling is the habit every later risk lesson is built on.
Open the Lab →- Three orders cover everything: market (fills now, price not promised), limit (your price or better, may not fill), and stop (sleeps until a trigger, then fires).
- No order gives you both guarantees. Market trades price for certainty; limit trades certainty for price — pick the risk that fits the trade.
- A stop-loss caps risk in normal conditions but isn't a guaranteed price — it becomes a market order when triggered. Enter with limits, always protect with a stop.