Web Content Accessibility Guidelines (WCAG) 2.1
Technical specs of what's required for web and app accessibility.
ADA & Section 504 Updates - Institute for Disabilities Research, Policy & Practice
If you're interested in the regulations.
WebAIM: PDF Accessibility
Reading Sounds: Closed-Captioned Media and Popular Culture (Book)
Not so much a "how to" but more about the "why" of captioning.
Web Accessibility Fundamentals Overview | WAI W3C
Online Courses | Accessible Technology – University of Washington
This page from UW links to guides on creating accessible webpages, working with accessibility in Canvas, and making videos accessible.
Web Accessibility Tutorials | Teach Access Initiative
This is a really great introduction to web accessibility. It is self-guided, but feels more like a tutorial than just reading articles.
Digital Accessibility | Harvard University
Accessibility for Teams
A ‘quick-start’ guide for embedding accessibility and inclusive design practices into your team’s workflow. The site is specifically for people working on government websites, but they're good standards for all websites (even if you're not "legally" required to be accessible... you really ought to be).
The Accessibility Playbook | NWeLearn Sessions
How we design our courses and our content makes all the difference in the world to our students.
Make your Google Doc or Slides More Accessible | Google Support
Avoiding the Use of Color Alone to Convey Meaning and Algorithms That Help | Pressbooks
Using Color to Convey Information | Harvard University
Color is a powerful visual means of presenting or distinguishing information, but when you use color to identify or distinguish information, make sure that this information is still available to people who can't perceive color.
Complex Images for All Learners
Excellent information on creating accessible charts and graphs.
Alternative Text | WebAIM
When to Describe Images
Does an image need to be described? That depends... walk through this interactive "decision tree" to learn about when and how best to make an image accessible.
Why Accessibility? Motivating Learners To Bring About Change | WebAIM
A good article to read if you're in the position of accessibility training. Straightforward and insightful tips.
Accessibility: Usability for All | Interaction Design Foundation
Good article on how accessibility and usability are basically the same thing.
Testing With Screen Readers | WebAIM
Course: Introduction to Web Accessibility | edX
Course: Accessibility: How to Design for All | Interaction Design Foundation
Focus is on web accessibility
Course: Accessible Documents: Word, PowerPoint, & Acrobat | WebAIM
Developing Web Accessibility Presentations and Training: Overview | WAI W3C
Curricula on Web Accessibility: A Framework to Build Your Own Courses | WAI W3C