Update: My new book, The ADA Book (link opens in a new tab) is now available on Amazon (and Amazons around the world). This book is a must-have and will give you insider knowledge on how digital accessibility works and what the legal landscape is.
The ADA Book is the perfect complement to my WCAG guide and checklist.
My WCAG 2.1 AA Checklist and Guide are now 100% free to download without any subscription.
The Checklist is a quick summary list of WCAG success criteria.
The Guide is a more detailed, plain English explanation of each WCAG success criteria.
Here is the full URL to each PDF:
Each PDF contains important disclaimers, copyright, and attribution information.