Mistake training builds puzzles out of your own games. When a game is analysed, the positions where you played something that lost material or evaluation are kept, and you are given those positions again — this time to find the move you missed.
General puzzle sets are drawn from millions of games by other players, so they train tactics in proportion to how often those tactics appear in chess overall. That is a reasonable default, but it is not aimed at you. If you reliably miss discovered attacks and never miss a back-rank mate, a general set will keep giving you back-rank mates.
Positions from your own games skip that problem. Every one is a position you actually reached, at your level, against an opponent playing the way your opponents play — and one you already got wrong once, which is the strongest available evidence that the pattern has not been learned yet.
There is a second effect that matters as much. Seeing the position again, knowing something is there, is very different from meeting it in a game. The gap between those two experiences is the thing worth closing, and repeating your own missed positions is the most direct way to close it.
Mistakes come from analysed games, so there needs to be a game to analyse first. Review one with Game Report, which runs Stockfish 18 over every move and marks where the evaluation moved against you. Those positions then become available to train.
Connecting a Chess.com or Lichess account from the home page will pull in recent games so there is a supply to work from rather than one game at a time.
Treat a repeat miss as information rather than a failure. If a position beats you twice, the gap is usually not the motif itself but a habit — not checking what the opponent's last move attacked, or not looking at captures before quiet moves.
Once a pattern keeps recurring, Woodpecker training is the mode built for it: a fixed set solved repeatedly until recall becomes automatic. For a view of which weaknesses cost you the most across many games rather than one, run a Profile Report.