Order blocks and fair value gaps are the workhorses. These three are the specialist POIs — worth knowing because they mark reversals especially well.
Breaker block. An order block that failed — price broke through it — and then flips polarity. A bullish OB that gets violated on a sweep can become a bearish breaker (resistance) on the retest, and vice versa. Breakers shine at turning points: they're the SMC version of an old-support-becomes-resistance flip.
Mitigation block. A prior area of order flow that price returns to "mitigate" — where trapped participants get to exit near break-even and fresh orders enter. Similar to an OB but framed around an earlier failed move.
Rejection block. Built from the wicks rather than the bodies — a cluster of long rejection wicks marking a price the market refused to accept. Useful where a clean OB is hard to define.
You don't need all of these on every trade. They're a vocabulary: the more precisely you can name why a zone should hold, the more selective — and the more disciplined — your entries become.