IntersectingObjects.cs

using UnityEngine; // A header/namespace that lets us use UnityEngine..

// A call called "IntersectingObjects" this will be different from case to case basis..
// that inherits MonoBehaviour which is an API..
public class IntersectingObjects : MonoBehaviour {

    // Create string with the public access modifier called "tagName"
    public string tagName;

    // A method in Unity to detect when objects intersect one another.
    private void OnTriggerEnter2D(Collider other)
    {
        // When the other object with the tag value of "tagName" collides
        if (other.gameObject.CompareTag(tagName))
        {
            // We destroy the gameObject that interseceted with it.
            Destroy(gameObject);

            // If you want to destroy the object you touch instead of yourself, for instance:
            // Your character is collecting a coin you could do:
            Destroy(other.gameObject);
        }
    }
}