Giving advice to a friend is as dangerous as loading a gun and pointing it at your head. Your opinions are loaded with your own personal regrets, flavoured with your life experiences and coloured with your jaded view of the world.
What makes your advice relevant to your friend’s pain and need for direction? Your own experience in the same vein? Does that mean you know it all or could give better life choices for him or her. Does it take in their character and natural response to things that happen in his or her life?