https://www.udemy.com/course/how-to-make-a-wordpress-website-2018-divi-theme-tutorial/
A beginner level course about the Divi Theme. The course covers the basics in a fair amount of detail, and although it's not an advanced Divi Theme course, it does cover a couple of more advanced subjects or features.
https://www.udemy.com/course/divi-wordpress-theme-for-beginners/
A beginner focused course over at Udemy for the Divi Theme. The course takes the follow along approach, taking you through building a few different page examples of a simple site. The instruction is clear and easy to understand, if you're looking for a beginner course on the Divi Theme, this is one of the better options.
https://www.elegantthemes.com/gallery/divi/