Battletech Universe forums are broken down into several categories, below is a breif description of what you will find in each category.
ComStar HPG Uplink- Contains News and Site Annoucements.
The Command Bunker- Contains Subscriber (Knights) and BTU Staff forums, only viewable if you have access to them.
BTU Information Center- Contains Contest, Welcome Center, MyBattletech Support, and BTU Comments and Support.
General Communications- Contains Battletech Roundtable and Off-Topic Discussion.
Miniature and Custom Design- Contains Hall of Miniatures, Miniature R&D, Design Bureau, and Terrain and Large Models.
Fan Fiction and Art- Contains Fan Fiction and Fan Art.
Battletech Gaming HQ- Contains forums for Battletech Gaming.
BTU Commerce- Contains Exodus Road Hobbies and Sales & Trading, and Trading Feedback.
BTU Project HQ- Contains TRO and Regiment.