Minecraft wiki entry for Multiplayer_PvP_bases, associated text: Once your main base is established, then you can begin tunneling and expanding. What will you make a tunnel to is your choice. It can be a wheat farm (same design for carrot and potato farms), a tree farm, a mob grinder, a mine or quarry, it's up to you. Just keep in mind that you'll need to claim everything that you expand into or else other players can get into your base.