It is important to apologize to people when you make a mistake. It is imperative (very important) to be a good listener to your friends. Your buddy might not need your advice or help solving their problem; they might just need to talk and explain what is on their mind and troubling them.
Friends stick up for their friends when they can; you might jump in and offer help to a buddy who needs it, and your friends can offer you help when they can. Friends are good to each other, and that's why they are your buddies.