When studying for my WAS exam I had a tough time learning keyboard shortcuts of screen readers. I experimented and created a mind map to help learn through a more visual format. It helped! Then I found videos of other people using assistive technologies in ways that weren't documented, which blew my mind. It sunk in! Finally I quizzed myself.
Here's my first article on The A11y Project on Learning common keyboard shortcuts for screen readers: https://www.a11yproject.com/posts/2020-07-24-learning-common-keyboard-shortcuts-for-screen-readers/