Collision Detection

Question

I'm working on a project and I make collision detection right now.
It works. It can check for rectangles overlapping each other but I don't know what to do when player collide a wall.
any idea? I want him just to stop walking to walls directions

Answer 1

if(player.xpos > screen.width - player.width){

player.xpos = screen.width - player.width
}

Answer 2

https://github.com/borislavvv00
Check my github acount to see how i do it.