Nasdaq has been coiling under 19,300 for an hour and you have somewhere else to be for the next thirty minutes. A buy-stop at 19,305 solves the problem entirely: if the level breaks while you are away, the order fires without you watching a single candle. That is the entire case for stop orders as entries, and it is a strong one, provided you also understand the trap that comes bundled with it.
How a stop entry actually works
A buy-stop is placed above the current price and triggers a market buy once price trades at or through that level, used to catch a breakout to the upside. A sell-stop works the same way below the current price, catching a breakdown. Both are dormant orders: nothing happens until price reaches the trigger, which is exactly what makes them useful for trading a level without staring at the screen waiting for it to break.
The breakout logic
The idea behind entering on a stop is that a genuine break of a well-marked level, a prior day's high, a session range, an obvious round number, tends to attract fresh buyers or sellers and continue, at least for a while. Placing the stop a few points beyond the level, rather than exactly on it, filters out a bare touch and requires an actual push through before the order fires. On gold, a buy-stop placed two dollars above a 2,410 resistance level rather than exactly at 2,410 avoids triggering on a wick that barely reaches the level and immediately reverses.
The trap: false breaks and slippage
Stop entries have a well-earned reputation for buying the exact top of a fakeout. Price pushes just far enough to trigger every buy-stop resting above the level, then reverses hard, because those triggered orders were themselves the last piece of buying pressure the move needed. This is common enough around obvious levels that it has a name, a stop hunt, and it is not usually a conspiracy so much as simple order flow: a cluster of stops at a known price is a predictable pool of liquidity, and fast markets often move exactly far enough to reach it. Add to that the ordinary slippage of a triggered stop converting to a market order in a fast move, and a stop entry can fill considerably worse than the trigger price on a genuinely violent break.
Pairing stops with a cancel condition
The fix is never leaving a stop entry order open indefinitely. Attach a cancel condition: if the level has not broken within a defined window, say the rest of the session, cancel the order rather than let it sit waiting for a break that may come at a worse time, like right before a data release, or not come at all. It also helps to size for the trigger price, not the current price, since a breakout entry usually needs a slightly wider stop than a pullback entry to survive the same level's normal noise on the other side of the break.
When to use a stop entry at all
Stop entries earn their place when a level is well-defined, the instrument is liquid enough that slippage stays reasonable, and you genuinely cannot watch the break happen live. They are a poor fit for thin markets or levels that get tested constantly, where the false-break rate is highest. Used with a cancel condition and a stop distance that respects real slippage, they let a trader catch the move that happens while they are not looking, which is most of them.