What do you do when you get into an argument with a friend?

If you fight with your close friend, what do you do? Do you give it some time, where both of you cool off and forget about it? Or do you try to find the root of the argument and confront it? Or do you do something else? I’m worried that if we don’t try to figure it all out, things will just fester and eventually bubble back up. But I’m also worried that if I try to confront the problem, it’ll just start another fight. What do you do?