Everyone has a friend. A friend is a person who will help you when you are in difficulty. But sometimes we have something unhappy between we and friends. Maybe we can quarrel with each other because of something. What should we do if we quarrel with our friends? Let me tell you.
Being a friend, you must understand your friend. If he has something different from you. You should respect your friend's idea and try your best deal with the things. But if you really can't get the same idea, even quarrel about it. I think you should applogize him or her when you get calm. Say "sorry" to him or her, and he or she will forgive you. You can get on well each other later.