What he sees and hears will affect his attitude towards life, even his values and world outlook, thus affecting his behavior.
Uncivilized surfing the Internet, watching unhealthy and harmful things, you will learn to simulate over time ... this may bring harm to yourself and society and ruin your life ~ ~ ~
Moreover, due to the limitation of age, their legal awareness and moral awareness are not strong enough, and the distinction between good and bad is not clear enough. If you look at something that leads to the wrong direction again, you are likely to have a wrong cognition ~ ~ ~