Nick Croft has just published the "Genesis Explained" book which is a developers guide to the most popular theme framework in WordPress.

Nick worked as a full-time support person for Genesis, before moving on to work as a developer on the framework. He later became a SaaS architect for the Rainmaker Platform, built on Genesis. Even before he literally wrote the book, he wrote the figurative book on Genesis. Nick is also a core contributor to Genesis and has multiple, popular Genesis plugins. Check out Nick's "Genesis Explained" book: https://www.ostraining.com/books/genesis