1. Sincere treatment: Treat friends with sincerity, without hypocrisy or disguise, and show your most authentic side.
2. Listening and Empathy: Patiently listen to friends' voices, understand their feelings, provide support and comfort, and share joy, anger, sorrow, and happiness together.
3. Mutual respect and trust: Respect friends' personalities, choices, and privacy, establish a solid foundation of trust, and make friendships deeper.