Crouching and Sliding problem using raycast

Hello friends first of all im beginner at programmer. My problem is crouching and sliding. My player only has boxcollider2D. I use raycastline to detect collider etc. What should i do / What kind of ways i must follow for apply crouching / sliding. Does resizing boxcollider works? I'm try to learn basics.

 

What the problem is actually?
If you want your player not to trigger collision with raycasts then you can change your player's layer to IgnoreRaycast layer (in player's Inspector).

 

Actually its not problem, im still thinking about how can i achieve this. Is resizing boxcollider a solution ?

 

Oh, since you've edited your question, now I see.
Yes, you can resize box collider to implement crouching. It's a commonly used method to do this.