Unity 2D. OnCollisionEnter. How to implement my chip?

Question

Unity

Hello. I'm new to this area, but I want to make a game. The problem is this... In the game, when the player falls out of the map, I made the borders of the map. If the player collides with one of the borders, then all his HP should be removed, I wrote OnCollisionEnter() , set BoxCollider2D at the borders, IsTrigger was not enabled, but still ... Nothing works. The player has a Rigidbody and a BoxCollider. Tell me what to do?

Answer 1

1. March to learn units from tutorials. And then the sisharp at first, if at all a beginner.
2. So 2d or not 2d? If the collider is 2d, then OnCollisionEnter2D is needed. And the player's collider should then also be 2d. Mix 2d and 3d PHYSICS no way