Bits and bobs, roughly documentation
    Items are in gamemode/shared/itemsystem
    Animations are in gamemode/shared/animations
    Prayers are in gamemode/shared/prayers
    HUD is in gamemode/client


Quests, Inventory, and Skills might all potentially do mysql injection, be careful in their creation, and don't let users enter any fields about them!

When createing new files, make sure the file has some text in it (even just a comment explaining what the file will eventually hold) include() will crash the game if called on an empty file.

If your server starts breaking after a while, it's probably the fault of /gamemode/shared/sh_buff.lua, no you can't put a bandaid on it to fix it, you have to re-write it.

Multi-serverness is defined in /data/artery/maps/<map_name>

PAC's to download on demand are in /data/artery/pacs/<pac_name>

two shop npc's within 200 units of eachother cannot sell the same item.

For creation:
  Finding the player's current position
  lua_run_cl local gp = LocalPlayer():GetPos() print(string.format("Vector(%.2d,%.2d,%.2d)",gp.x,gp.y,gp.z))