Ingame
Stealth - Abusing combat flags and going into stealth while in a fight (a player is chasing you within 20 yards or attacking you) is considered abusive due to the combat system flaws *If someone reports you for using stealth in a fight you must prove you used vanish or got disconnected
Hunter's Mark - Do not use it in PvP untill its fixed.
Buffs Stacking - Do not stack buffs like Mark of the wild and Gift of the wild or PW: Fortitude with lower rank of PW: Fortitude.
Unique-Equipped - Do not wear double (same) Unique-Equipped Rings / Trinkets
Shattrath - There should be no way to attack in this city (You can do duels only)