How can i make a player stop when he hits the obsticle

NewDev

i've watched the 5th episode of brackey's tutorials "how to make a video game in unity COLLISION " But still i can't figure it out. it doesn't even show the message in the console when you hit an obsticle or the ground. please help me maybe you have a code for that

Redimator

Before you run the code, You must add a layer called Obstacle in your GameObject.

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class CollisionDetection : MonoBehaviour

{

    void OnCollisionEnter2D(Collider2D collision)

    {

        //Detect if this collision hit the other collision with a name of the layer.

        if (collision.gameObject.layer == LayerMask.NameToLayer("Obstacle"))

        {

//Debug the collision.

            Debug.Log(collision + "is touched!");

        }

    }

}