Major Description
See the following documentation:
https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/-reg
https://github.com/volatilityfoundation/volatility/wiki/Command-Reference
and:
https://webcache.googleusercontent.com/search?q=cache:fmHJX9eFGkkJ:https://blogs.technet.microsoft.com/ganand/archive/2008/01/05/internal-structures-of-the-windows-registry.aspx
and
http://moyix.blogspot.com/2008/02/enumerating-registry-hives.html