Many GitHub repositories include markdown-based study guides, command cheat sheets (e.g., Volatility, Logparser, Plaso), and mind maps. These serve as excellent secondary materials to place in the back of your index binder. The Danger of Using Pre-Made GitHub Indexes
You only learn the material by typing out the index yourself. Use GitHub for the structure, but provide the content. sans 508 index github
or sec508-index