Minecraft wiki entry for Multiplayer_survival, associated text: While these servers are not 100% safe, they are generally cheater-free, friendly and encourage cooperation. There is not much strategy needed apart from a singleplayer world, and depending on the server, you might be safer to build things that you would normally not in a singleplayer world (e.g. creeper explosions turned off), and it is also recommended to engage in trade, if the server's players have set up an economy or you happen to be near a lot of players. Trading with players is a good way to start making new friends, along with helping them in various ways. The only rule is to be nice to others to get the best experience from these servers.