On move 5 after Nf6, white could have played Nxf6+ then after you take the knight back, he could take your bishop with his queen. Tactics like this you can practice by just doing a ton of puzzles, then you’ll start recognizing patterns like that and not hanging pieces. This is still a very good game for 600 tho even with the hanging piece, play like this every game and you’ll gain a lot of rating. Best way to improve at those lower levels is as I just said puzzles, because almost all games are decided by tactics, someone hanging a fork or a piece or something like that.
My elo is 600, btw. Can anyone help me improve by giving me suggestions?