A stop-loss is an order that sells your position automatically if the price falls to a level you chose in advance. You set it when you open the trade, while you are calm, so that the decision to get out is already made before the moment you would least want to make it.
It is the one habit that separates people who keep trading from people who stop. Not because it makes you money, but because it caps how much any single mistake can cost.
How to place one
- Put it where your idea is wrong, not where it hurts. If you bought because a support level held, the stop goes a little below that level. If the price gets there, the reason you bought is gone.
- Size the trade from the stop. If the stop is 4% below your entry and you are willing to lose 1% of your account, the position is a quarter of your account. The stop decides the size, never the other way round.
- Give it room. A stop set a hair below the entry gets hit by ordinary noise. Measure the market’s normal wobble (traders use the average true range, ATR) and keep the stop outside it.
- Do not move it down. Moving a stop away from the price turns a small planned loss into an unplanned large one. Moving it up, to lock in profit, is fine.
Stop, stop-limit, trailing
A plain stop becomes a market order when the price touches it: it fills, at whatever the next price is. A stop-limit becomes a limit order, which protects you from a bad fill but may not fill at all in a crash. A trailing stop follows the price up by a set distance and never moves down, so winners are protected without you watching.
March 2020, hour by hour
On 12 March 2020 Bitcoin fell from about $7,900 to under $4,000 within a day, with hourly candles that moved more than many weeks do. Three things happened to people without stops: they watched the first drop and hoped, they watched the second and froze, and they sold near the bottom when the fear finally beat the hope.
People with stops lost a planned amount early, often in the first hours, and were still solvent when the market bounced the following week. Some were stopped out and bought back lower. The stop did not predict anything. It only kept the loss the size they had chosen.
In Climb From Zero this week is a history challenge: real hourly candles from 8 to 14 March 2020, stepped forward one at a time, with a goal that is about how you trade, not how much you make: finish down less than 5%. Most players who finish inside the goal did so because of one stop set on the way in.
The mistakes beginners make
- Setting it too tight, then blaming the market for “hunting” it.
- Setting it at a round number everyone else is using.
- Cancelling it “just for tonight”.
- Not setting one because the trade is small. The habit is the point; the size is not.
Practise it with fake money
The stop-loss is a habit, and habits need reps. A trading simulator lets you place hundreds of stops on real price history before one of them has to protect real money. In Climb From Zero the order ticket will not let you buy without a stop in strict mode, the journal grades every trade on whether you kept it, and the mentor tells you where it sat against support and resistance.
A simulation. No real money. Not financial advice. Nothing here is a recommendation to buy or sell anything.