How does this qualify as "brilliant"??

I am not a chess beginner, but I do have many questions

How?

How is it even possible to deliver a checkmate with a king?

My dad asked me to teach him about chess, and this happened in our first game

I started without a queen to balance the odds for anyone wondering

Am really proud of myself for finding this checkmate

Why did the game not end..... WHY DID IT NOT END 😭

When you can’t find your chess board but find two sets of scrabble

How is this a good move. Best moves shayd that he wouldn't take but why not

My first game with 0 mistakes This one was my biggest inaccuracy

Why is it better to take the bisshop then the rook?

White to move, mate in 10

Ngl I'm pretty proud of this move

I'm a low elo player aka noob and I'm pretty proud of myself for not missing this