Hello everyone

I am totally new to the site and i was exploring the site and have noticed that too many users are banned. Most of them are newly registered users.
What have those guys done to get banned? Don't get me wrong, i am not questioning decisions of admins, moderators etc. I just want to know what could be the reasons so i can stay away of these intolerable behaviours.

Thank you all in advance for your replies.

PS. Sorry if i posted this topic in inappropriate section.