This is a good start. I would strongly recommend focusing on listening and asking questions when a friend comes to you with a problem or something on their mind

This is a good start. I would strongly recommend focusing on listening and asking questions when a friend comes to you with a problem or something on their mind. People universally want to be heard and understood. Offer emotional support, if by some chance you really think your friend is in the wrong, that person probably needs to be lovingly nudged rather than abrasively confronted. Occasionally people do legitimately want your advice & perspective and to be careful about it you can precede it with "would you like to hear my perspective/advice?"