Your opponent was just blind, and didn't see obvious things for advanced players, like your attack on his h6 knight, and he overlooked even an obvious checkmate threat, which looked inevitable at that point. I can't say anything special about this game, like what you did wrong, just a typical game for your rating, OK?
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I did this castle checkmate, and was wondering if there were more requirements for castling than just "Castle early". I also wanted to see if there were any alternatives that would've gotten me checkmate quicker.