What's the difference between a superficial friend and a real friend?

A shallow friend means that when you are in trouble, he won't help you, but he won't hurt you, but he is also in trouble. You can help him, but he won't help you. It's called a shallow friend. A true friend is someone who will help you when you are in trouble, but he is also in trouble and you will help him. This is called a true friend, so there is a difference between a superficial friend and a true friend.