I've read one of these articles and bookmarked the other. They give some introduction to the problem space, with pictures. I'm no expert though and can't rate their accuracy; Just know they helped me feel a little more confident about the basics.

https://preshing.com/20120612/an-introduction-to-lock-free-p...

http://lucteo.ro/2018/11/18/look-ma-no-locks/