This part of the wiki covers the specifics of the Sigma Draconis Expanse server (SDX).
Refer to the Official Space Engineers Wiki for all things vanilla.

While most of the wiki is maintained by members of the community and thusly to be treated as unofficial information, the rules are the official rules endorsed by SDX staff.
General Information provides an overview of the features that make SDX unique
Rules - Make sure to stick to them!
New Player Guide is supposed to help you get to know those features
Star maps - The game world of SDX
Trade Stations - Where to find them and what they buy and sell
Ilus ring world - The non-PvP planet
Jannah ring world - SDX with training wheels
Adro ring world - Nation-based end-game group hunting
NPC hunting - Farming parts for the good stuff
Weapons Guide - How to dakka with WeaponCore
PvP ship design tips - An overview
Ariel KOTH - Recurring, nation based ship PvP
Io KOTH - Always-open suit PvP
Nations - Info about the three mega-alliances that most players align themselves to
Items of SDX - Lists custom components and items and what to do with them
More Guides - Links to - you guessed it - more guides, both on this wiki and on the greater internet