Accessibility: Website Structure and Comprehension
Accessibility can be added on at the end or it could form the foundation of all your projects. This course will help you build robust and semantic websites that can be used by absolutely everybody.

A Pluralsight course on building websites that work for everybody, including people who use assistive technology. Instead of treating accessibility as something to fix at the end, it goes back to the foundations: semantic markup and structure, interactions people can follow, and interfaces people can perceive across a wide range of abilities.
Beginner level, 1h 35m. One of the four courses I wrote for Pluralsight.