Why is this not Checkmate?

Got my answer from a few helpful people below. The rest are just rude and condescending.

Stalemate. King got nowhere to go and isn't in check

It’s a draw too, not a win

In both cases your opponent has no legal moves, but is not currently in check.

This is called a stalemate- IM Eric Rosen has a number of videos on youtube and likely here as well; that show him getting stalemates out of games he would otherwise have lost.

Snatching a draw, out the jaws of a loss.

just to emphasize the main point again: it's not checkmate because it's not check.

in the first one, rook to g2 instead of g3 would have been check and checkmate.

In the 2nd position, the bishop move was wrong. Instead of Be6 you should have played Qb7. Now the black king has a square to move to...e8. Now slide your queen along the 7th rank, to Qe7, and you have checkmate. In the endgame it is best NOT to surround the enemy king with a lot of pieces if you still have a powerful piece like a Queen or Rook. If you don't know how to mate with just your King and a Queen or Rook, look it up, as it is a basic and very common endgame.

It's R8g2++, not R8g3

Stalemate

Stalemate

Its stalemate

This isn't Checkmate because the king still has a legal move to escape the attack. Checkmate requires the opponent's king to be in a position where it cannot move to a safe square, capture the attacking piece, or block the attack. Stay sharp and keep analyzing your moves.

"Stay sharp and keep analyzing" great advice - C4F

Big bunder! Black king can't move!

It's because you did not read the game rules gefore starting to play.

Stalemate

Think if I understood what a stalemate is, I'd post this? If you're not going to be helpful to a clear beginner all you had to do was ignore the post. Easy

Oh you understood every thing about chess as a beginner? Wow, want a cookie?

I understand now, thanks a lot!