I saw lots of videos and a didnt find any who works.
Can some one teach me how to make a jumpscare please! 
It’s easy, u need to learn some basic scripting to make it 
How can anyone teach you how to make a jump scare, you have not told us any more details, not told us how or why they would be scared of something. Such a useless question, and you will get useless replies.
I think, he would like the scary face popping at the screen with weird sound on random moments, right?