Any kind of adult content that includes underage persons is not allowed.
Keep local timeline safe for work.
Be careful with people that don't understand jokes, they can be offended.
Try to keep civil discourse even if the other side is not. Some people are kind-of-autists and they're don't really know when their behavior is toxic. That does not make them bad.
Respect free speech, but do not abuse it.
Keep public content in English, French or Russian.