A few small questions

yes, black's 5th move is bad, as White's c3 pawn advances to d4 and clears its square for the best development of the Horse.   Also it opens up the "c" file for a Rook to bear down pressure on Black's position.

White should have played 12 Q to f2 to avoid the tactic u had on his center pawn.

Black's 19 exchange of B for Horse is very good to "simplify"....as the more pieces go off the Board when u r ahead, usually the more pronounced your advantage becomes !

very well played by Black !   congrats

White throws away 2 pieces for nothing.  Bxg3 is great, though its technically a won game if he won't resign this gets you that much closer to the end.  

22) ignore the pawn.  try to find an assault on the king or a way to weaken him.   My move on 22 would be Ne2+.  king must move onto the a file (or he can toss a rook for your knight?), now loft Rc6 and try to trap the king in the corner.  Now its a race (and I am not sure if he can wiggle out or not) ... loft the other rook and pound the king before it can get away -- and there are multiple opportunites to either snag a rook free or force a trade which favors you.