From the introduction:
The Dungeons and Dragons Adventurers League has been around for a few years now, and a lot of content has been created during that time. A number of high-quality hardcover books, a huge array of PDFs, and a whole slew of other play options have been introduced – and this means that it can be a lot to track, especially for the casual player!
To remedy this, we’ve decided to publish a listing of all legal play options for our players and Dungeon Masters. It’s been a lot of work getting our notes into a readable format, but we’re committed to the vision: expect an updated version of this document about once per quarter.