Chess.

Chess gives a decision a clear setting: a visible position, limited time, and another person with a plan. The interesting part is often the gap between the move that looked natural and the idea the position actually needed.

A useful review starts with your own thinking. Mark the moment you felt uncertain, write down the candidate moves you considered, and identify the opponent's strongest reply. Comparing that reasoning with later analysis makes the lesson more specific.

Tactics, endgames, and positional play reward different kinds of attention. The common habit is to explain a move in terms of the position it creates. A well-understood mistake can be a more useful lesson than a move you happened to get right.