Stop Loss Covering
The rule that your stop loss must always sit beyond protected structure, not at it.
SL must cover protected structure by 2 pips minimum. If price briefly wicks protected low/high and sweeps stops placed AT the level, you want yours sitting 2 pips past - so the sweep triggers others' stops, not yours. This single discipline saves more accounts than any other.
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Learn to actually use Stop Loss Covering.
Definitions are the easy part. The free first five modules put this on a real chart and make you do the work. No card required.