No swearing: sometimes a word is bleeped due to some unknown or accidental reason, let a person explain themselves first before jumping to conclusions.
No ridiculing new players
No cheating other players
Thank you and pleases were taught to you for a reason
If you are selling something: tell the price you want for it in order to avoid the "offer" conversation.
If you are buying something: name the price you're willing to pay for an item to avoid the "offer" conversation.
Always thank someone when you have been revived,
And if you are down politely ask to me revived.
No 'rev me up fools' as I once said that and they refused to revived, making me waste 5 minutes getting back to where i died, only for the game to end.