First of all I wouldn't recommend playing the group opening. It's pretty bad and doesn't accomplish much so try learning a different opening. 3. bf3 was bad because it moved the same piece twice in an opening and it obstructed your own knight's development. 4. d3 just straight up blundered the bishop. These sort of 1 move blunders can be prevented simply by double-checking the board before every move. furthermore exf3 just worsened your position. nxf3 would've been so much better. 6. ke2 was bad because it lost castling rights. something like bd2 would've been better. Basically the entire opening was a disaster which needs to be fixed. Try learning a a simple opening like the London System.
16. nh5 was a blunder after dxc4+. Once again all those simple 1 move blunders can simply be fixed by double-checking the board before every move. You were also trading down too many pieces while down material which you generally want to avoid doing unless there is some sort of tactical motif which gives you an advantage or gets closer to evening out the game. Move 23 and 24 missed rxd8 and furthermore blundered your own rook. The game overall was very shaky and you had a lucky escape after your opponent blundered heavily. You need to work on these things.
@Smiley_face10 I had this game ... I thought. Tough opponent and I was giggling halfway through expecting a rare victory and then game flipped upside down on me. Could use your eyes upon it if you get the chance. I need ALL help I can get to beat @FelixG711!
I am white.
To be honest, I would have looked hard at 17. Qd5+ Bxd5 18. exd5 creating a protected passed pawn. The biggest takeaway I saw is you playing "see check, play check" moves, which if Black can get his King safe, leaves the pieces uncoordinated, resulting in losing the initiative. Either that sac to get rid of the dark squared Bishop or at least simply playing to get your Rooks active, dominating any open files. once Black got Bxc5 in, you started getting cooked. Try to make plans that take into account your opponents worst pieces, finding ways to not allow them to get any good scope. It's essentially like being a piece up.