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Coursera: Web Accessibility Courses
The online learning platform offers web accessibility courses for beginner and intermediate levels.

Learn How to Build Accessible Web Apps
Wow that is a super nice initiative! Marcy Sutton offers a free six weeks email course to help you building and testing accessible web applications.
Illustration: testingaccessibility.com

Introduction to Web Accessibility
This free course presented by the W3C will give you solid foundations in accessibility and help you provide a better experience for everyone. Note: if you want to earn the certificate, you'll need to switch to the verified course.