How to embrace and digest the entire body of knowledge that Large Scale Scrum (LeSS) offers?

How to understand what is foundational, what is minimally required and what is optional?

There is a graphic on less.works site that graphically illustrates LeSS Principles, Frameworks (Rules), Guides & Experiments. However, how the aforementioned relate to one another may require some additional explanation. 

In their short recorded message, James and Gene are trying to explain how to read the complete picture of LeSS. Understanding this, will help you navigate less.works site, understand LeSS case studies and read LeSS books.