Smile to the people around us; smile is the rule of life. It's the so-called "reach out and don't smile". No matter what others do, we treat them with a smile, and everything will be better.
Be polite to the people around you; shake hands with each other at the first meeting, say hello to each other at the next meeting, and gradually get familiar with others. Don't disturb others in life, and do what you don't want to do to others.
Learn to care for others; in daily life, know how to care for others, and then a greeting when a friend is ill, and reach out a hand when a friend needs to make a friend feel warm.
In daily communication, treat people sincerely and do things in good faith. Don't be selfish. Try to find out more for your friends. Focus on the interests of your friends and put the things of your friends first.
Keep in touch with friends often; the strongest feelings will be destroyed by time, more contact, more communication, mutual understanding, mutual tolerance, so as to make friends last for a long time.