Let me answer what is heart-to-heart, but there is actually one thing you should know. Sometimes you are unhappy. Who else will you think of besides your parents? Sometimes he can help you share your worries and help you when you need relief. If you just have nothing to do, friends can tell you, because these things are not your concern. Sometimes I don't care to share it with everyone, and I feel like a good friend. Sharing with friends is a happy thing. You are willing to tell her that only by speaking your mind can you understand each other better. Some people who don't understand you will throw cold water on what you do. At that time, you will be wronged. What about good friends? She knows you and may not say much, but she will understand you. When you need help, she will step forward. This is a friend.