Can I tell a guy I know how to drive?
Do you ever drive by yourself?
Yes, I have been driving almost every day
As long as your friend isn't driving dangerously, you shouldn't tell him how to do things.  If he needs help learning to drive, though, then you can help him with the basics, but then he should get a professional teacher.
I don't see the problem. He's my friend.
People do not like to be told what to do. It's better to initiate a conversation about driving and traffic. Coming on strong will make him defensive.