Answer and Explanation:
You can advise your friend to avoid dangerous behaviors and to avoid friendships with people who are involved with negative, dangerous and even criminal activities. That's because these friendships can influence your friend to do the same negative things, preventing him from enjoying youth in a positive way and negative behaviors can do the same thing.
With a positive behavior, your friend will be able to take better care of his life and future, he will be able to fully enjoy the youth, he will have a bright future, be successful and a pride for the family, in addition to becoming a useful individual to the country.