Make sure your attacking pieces aren't left hanging, or unprotected
How to make quick chekmates without my opponent even notice about ?
Don't leave your pieces undefended .In your games many pieces are left undefended easy win for opponent.
Look for fork, double attack , pin discovered attack.
Fork:
They will move one piece ,you can capture the other
Piece Value:
Pawn : 1
Bishop/Knight : 3
Rook : 5
Queen : 9
"How to make quick chekmates without my opponent even notice about ?"
++ You ask the wrong question.
The aim of chess is to checkmate, but there is no bonus for a quicker checkmate.
Chess is a game of full information, so your opponent will notice if he pays attention.
So it is rather how to checkmate without the opponent being able to avoid it?
The first step is to avoid being checkmated yourself, i.e. noticing any checkmate threats yourself.
Try not to rely on gimmicks or your opponent not anticipating the threats against them. Develop your pieces using sound principles.
Once you're comfortable with these opening principles (and I don't mean memorizing an opening line) you can graduate to learning more about how to spot tacts to win pieces and eventually the game.
Check out this lesson on opening principles. https://www.chess.com/lessons/opening-principles
Let us know what you think.
I'm making this question because everytime I try to make a chekmate my opponent notice about my plans and then ruin it.