TL:DR - Treat others as you'd like to be treated.

Attacking other users
Do not attack or comment negatively about others. Get in touch if you feel you're being attacked.
Inappropriate content and language
Comments which contain racist, hateful, sexual, illegal or violent content or link to or quote such content are not allowed. Do not advertise other sites, referral links, etc.
Do not troll, abuse memes or spam.
Do not bypass suspensions, impersonate others or otherwise misuse accounts.
Personal Information
Do not post personal or private information.