Forums is a place where players come for information and discussion, Don't ruin forums for everyone. What I mean by "ruin the forums" will be bulletined..
-Harassment of any sort (Keep your drama off my forums)
-Explicit material posted
-Works that you take credit of that aren't yours (meaning cite your posted images/links/material)
-Profanity, I suggest you don't use them, especially towards some one.
-Unnecessary Conflicts
-Spamming
-Offending someone
These will get you banned from forums.