Friends can give you a lot of things, but there are also many things you can't give you. First, you can't give your parents the same affection. Parents are people who treat you unconditionally. Second, I can't give you love like a lover. Third, you can't give what you have, such as the ability to support yourself, your personality and self-esteem, the way you communicate with people, and the ability to seize opportunities. These things need to be mastered by yourself, and friends can't give you. So what your dad means should be that it's okay to make friends, but don't bet everything on friends.