Don't be a dick.
You may only kill when raiding, counter-raiding, under/at airdrops, at a downed helicopter/chinook, at a timed loot crate, on the cargo ship, and in radtowns/monuments (anything with a text label on the map as well as cargo ship and the oil rigs).
Maximum group size is 4. You may only raid with your main group with whom you base.
A quarry can be walled in, and any associated structures on/in a quarry can be taken over.
No griefing or taking over a base as a result of a raid (note Quarry exception above).
No placing traps outside your walls and no placing turrets that can shoot outside your walls (even when raiding, at an airdrop, or downed helicopter). SAM sites can only be placed on your primary base or in the compound where your primary base is located.
No attempts to damage or use admin created items/buildings in any ways not intended (including but not limited to as defense from the helicopter/chinook when attempting to take it down).
Approximately 24 hours before wipe the purge starts. You'll be given mass amounts of food, weapons, and explosives and can basically go nuts. During purge there are no rules so destroy, kill, and cause general mayhem to your hearts content.