I don't have much of a chess brain yet, so using undo has been very helpful for me to try different lines to see how they play out. It allows me to learn a lot from a single game. It also helps me avoid having to abandon a game that might have turned out pretty interesting if not for a dumb mistake.
I don't use undo when playing against human players online (except for the friend last night who offered it), so if I make a dumb mistake, I just have to take the loss and move on. It's not as educational for me though when that happens. This morning I lost a game about 20 moves into it because I made a lame mistake. I was checkmated on the very next move and didn't even see it coming. That was too bad, since I'd have liked to have seen how that game might have played out if I hadn't made that mistake. Too late now.
Chess can be pretty unforgiving because if you make a mistake at the wrong time (which is very easy to do as a beginner), you could lose within the next couple moves. The most frustrating part for me as a beginner is making a dumb mistake because there was something I just didn't take enough time to notice. My brain doesn't immediately perceive a chessboard like an experienced player would. I have to think through every angle very consciously, and that takes a lot of time.
I'm not sure if it's better to just play fast and loose and deal with the mistakes I make or really try to think deeply about each move. If I take the time to really consider each move, a single game could take over an hour.
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