Advice on how to have a good friendship

First you and your friend would have to be honest with each other and if one of you get in trouble then get the person in trouble out of trouble or at least try. If you hear people talking about your friend then help them out and tell that person to stop. For example today these eighth graders were talking about one of my best friends (chailyn) so i went up to those people and i said "Stop, thats one of my best friends and she's sick and thats not nice for you to talk about her", then they said "Oh im sorry", so thats what people should be doing instead of being two-faces and talking about there "friends" behind there backs.