Learn to laugh at yourself and your shortcomings. It will relieve some of the stress in your life. If you ever feel like poking fun at someone, let it be you, never anyone else. Smile, smile, smile. Respect the rights of others.
Different opinions are healthy.
Learn how to listen to others without putting them down or trying to convince them that your opinion is right. Throughout your life, you will learn that if you are kind to others, they usually will be kind to you. Give someone a compliment. Open the door for someone. Wave to a friend.