Scripto(Script Tutor)
Ep1 : first Nulls and nonNulls

void is a function that is empty from any variables like:

var GameObject;

var Char;

var Rigidbody;

var Animation;

var AnimatorController;

For Example :

void OnCollisionEnter (Collision : theCollision)

{

     if(theCollision,GameObject.tag == "Bullet");
     {
           Destroy(gameObject);
     }

}