Why is this move a miss?

Black’s knight is preventing my rook from doing a mate in one and it’s being attacked, neither of its escape squares can help it defend my rook’s attack and black’s bishop can’t take my knight because it is pinned to the king.

Black has forced mate

Glad I saw that in game, opponent was up by +6

I finally beat Antonio!

Screw stalemate. All my homies hate stalemate.

White to play and stop black's attack

Lol I found this

Huh

How do I avoid losing games from positions like these?

I primarily play 3|2 and fluctuate between 500-600 rating. I find myself dominating a lot of my games yet miss out on clear checkmates quite frequently. What can I do to work on this?

Why was this move brilliant?

I was playing a bot and made a brilliant move but don't understand why it's considered brilliant. Can someone please explain?

Would you have found the best move here for white?

I’m genially curious if people at my elo would find the best move here or if I’m just bad.

First brilliant in ages, had to post