https://developer.mozilla.org/en-US/docs/Learn/Common_questions/What_is_accessibility
- This article answers common questions about what web accessibility is. It discusses general principles and basic practices to make websites more accessible
https://developer.mozilla.org/en-US/docs/Learn/Common_questions/HTML_features_for_accessibility
- This article discusses certain HTML features that aid with accessibility. Specifically, it explains ARIA labels for links, alt attributes for images, and the ARIA role attribute.
https://developer.mozilla.org/en-US/docs/Learn/Common_questions/Design_for_all_types_of_users
- This article discusses specific ways to design for all types of users. This includes appropriate color contrast, font sizes, line widths and image compression
https://www.w3.org/WAI/fundamentals/accessibility-intro/
- This article provides an overview of what accessibility means. An important point it makes is that it's most efficient and effect to incorporate accessibility from the very beginning
https://en.wikipedia.org/wiki/Universal_design
- Article discussing universal design. Some points that stood out were the goals of the Center for Inclusive Design and Environmental Access and the idea of designing things that are "Barrier Free"
https://en.wikipedia.org/wiki/Selwyn_Goldsmith
- Article on Selwyn Goldsmith, one of the early advocates for accessible technology
https://www.w3.org/WAI/WCAG21/quickref/
- A quick reference guide to the Web content Accessibility Guidelines (WCAG). I like how it provides an overview of each point, and then allows you to dive deeper and better understand each aspect of each principle
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5820628/
- Provides data about how many people in the world are visually impaired

Accessibility on the Web