You are about to enter The Land of MUD, the Multi-User Dungeon.
This section contains the basic information you will need to play MUD, and it should be read before you commence playing the game (unlike the MUD De-Mystifier, which will help you through your first few sessions but needn't be read just yet if you are keen to start as soon as possible).
There are two main parts to the Beginners' Companion. The Overview gives information regarding a number of important topics in MUD, and if you have time then you should read it. If, however, you prefer to delve straight in, skip it and go straight to Practicalities.