How to handle object collision in C#?

Question

Unity

Can you please tell me how to compare tags of colliding game objects from different arrays (lists) in C#?
I need to write a code that, when colliding, calculates whether the colliding objects have the same tags, if they are the same, then one action, if not, then another
Ps I am a beginner
I work in Unity, objects collide through the OnCollisionEnter () function

Answer 1

I propose from the beginning to answer the question - how is it determined that the objects collided?

Answer 2

If I understand correctly, the code should look something like this:

private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.tag == "Тег объекта")
        {
            
        }
        else
        {

        }
    }