Second, we need to keep our promises. When we associate with friends, we need to keep our word, or the other person will think that we don't regard him as a friend at all. Keeping promise is also one of the basic principles of making friends.
Making friends after 03 needs to have the same topic, which is one of the basic principles. Without a topic, such a friend will be particularly embarrassed and even chatting will be a problem.
Finally, friends should help each other, which is also one of the basic principles, but when friends are in trouble and ask for money, we need to help them in time.