Running the analysis is the easy part — using it well is what improves your chess.
A full game review will flag a handful of Inaccuracies in almost any game, even strong ones — that's normal and not worth dwelling on. Go straight to the Mistakes and Blunders first. Those are the moments that actually decided the game, and they're the highest-value places to spend your review time.
Seeing that the engine preferred a different move is only half the picture. Before jumping to the suggested line, pause on the position and ask what you were actually thinking — what did you consider, and what did you miss? Then check the engine's line and see whether it was a tactic you overlooked, a plan you misjudged, or just a detail (like a hanging piece) that slipped past. That distinction matters more than the move itself, because it tells you what to actually watch for next time.
A move labeled Miss means you were already clearly winning and let a large chunk of that advantage slip. These are often the most useful moments to study, because the hard part — getting the winning position in the first place — was already done. The question isn't "what's the best move here," it's "what did I overlook in a position that should have been comfortable."
Don't just glance at the suggested move and move on. Open that exact position in Explore mode and actually play out the engine's line a few moves deep. Seeing why a move works — not just that it's rated better — is what turns a review into something you'll actually remember during your next game.
If you notice the same kind of mistake showing up across several games — missing forks, misjudging exchanges, overlooking back-rank issues — that's a signal worth acting on directly. Filter Puzzles by that specific theme and drill it deliberately for a session, rather than hoping it improves passively over more games.
Reviewing 40 moves of a game closely takes real focus, and reviewing every single game you ever play, closely, isn't sustainable and usually isn't necessary. Reviewing your losses and your close, hard-fought games tends to be far more instructive than reviewing an easy win — pick a handful of games that actually challenged you and go deep on those instead of skimming everything.
Full label reference: Understanding Move Classifications.