Resources

ARIA resources

Start here: https://w3c.github.io/using-aria/

W3C Resources

WAI Resources: https://www.w3.org/WAI/Resources/Overview

WCAG 2.0: https://www.w3.org/TR/WCAG20/

How To Meet WCAG 2.0: https://www.w3.org/WAI/WCAG20/quickref/

Understanding WCAG 2.0: https://www.w3.org/TR/UNDERSTANDING-WCAG20/

Techniques for WCAG 2.0: https://www.w3.org/TR/WCAG20-TECHS/

WCAG 2.1: https://www.w3.org/TR/WCAG21/

US Government Policies & Resources 

Section 508: http://www.section508.gov

18F Accessibility Guide (wip): https://pages.18f.gov/accessibility/

The US Government's online hub for Usability info, includes a repository of great how-to's, templates, and tools: https://www.usability.gov/

Canadian & International Guidelines and Policies

AODA (Accessibility for Ontarians with Disabilities Act): https://accessontario.com/aoda/

The BBC's Mobile Accessibility Standards & Guidelines: http://www.bbc.co.uk/guidelines/futuremedia/accessibility/mobile/about