I've created numerous lessons and courses teaching people about various aspects of accessibility through my email list and egghead.io.
10 days of A11y is great for beginners to a11y. It helps you get into the mindset of accessibility while giving you small pieces of homework. I made this course to help folks get some quick wins with accessibility. Low Effort, High Reward!
Take the free email courseOne of the best ways to learn about accessibility is through projects! Inspired by a project that I did at a former employer, I created a course to build an accessible audio player. This is a more advanced course about architecting components with accessibility in mind.
Take the course on egghead.io