Where did i go wrong?

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Tactic2Win
What would have you played move 13. and 21.?
btw this is the only game i played so far where i lost by that much. the point of this game was for me to explore the italian game. i lost only 2 rating points at the end of this one..
FessMate

your could win this game on 10.Bg5

10.Ng5 its a blunder what this knight doing there?

13.Nh3

Puroi

13.Nh3 21resign

Tactic2Win

lol ok,

but how would i win with 10.bg5?