The flip
When support breaks, it often becomes resistance (and vice-versa). A retest of a flipped level is one of the cleanest, most reliable price-action entries.
Entry / stop / target / invalidation
Entry: on the retest with a rejection candle. Stop: beyond the zone. Target: next zone. Invalidation: price closes back through the level. Good example: broken resistance retested from above → long. Bad: entering mid-air with no level or trigger.