Children's education is not carried out in adolescence, and comprehensive education should be carried out from an early age. Adolescent children should start with thoughts and change incorrect thoughts and bad habits.
In fact, when I was a teenager, you took all the above. Making friends is a child's freedom. In general, we should not stop them or support them, but we should always pay attention to their movements and stop them when necessary.
Let him read more classical books, and his sense of honor and disgrace is more reflected in classical books.
As for unhealthy books and images, I think it may be inevitable, because now is the network age, and all kinds of bad information can be presented to us at will. As an adult, I sometimes can't help but click and have a look.
Do what you have to do. In short, everything parents do is for the good of their children. It is important to choose the right way.