Why is this considered a mistake? (White king was forked and moved from e2 to f2)

Just hit 800 for the first time!

Hit 1300 for the first time! I really like the new way chess.com does game reviews and it has helped me improve a lot.

So annoyed at this game

What about it?

White sets up mate with Qg4. Black supposedly counters with Qc3, pinning the d2 rook to the king, so if black plays Qd2, white can play KxQd2. Obviously I know that’s not how it works, just so annoying cause I was completely outplaying my opponent and then I lose because of a mistake like this.

Any way I could’ve won?

What about it?

I’m black. Was there any way to win from this position?

Is this brilliant because it is, or because I'm 700?

I present to you my dumb version of 'wait, why isn't it ending'

This triple fork I created towards endgame

What about it?

Resignation soon afterwards

Why.... Why the brilliant????

What about it?

I didn't sac a piece???

Nice

This one felt good