Post mortems can be an interesting learning opportunity, and not necessarily our own. You can learn a lot about how strong players think by watching them analyse after a game.
Of course the greatest opportunity to learn comes when we analyse with a stronger player right after we’ve played them. And as this is most likely to happen if they’ve just won it pays to be a gracious loser.
Here are two well known GM body builders conducting a post mortem, Sergei Tiviakov and Fabiano Caruana.