This document attempts to give you the tools needed to answer questions and explain the mysteries of gpg and PGP so that you too can take advantage of this tool and stop making excuses.
Found on https://rgoulter.com/blog/posts/programming/2022-06-10-a-visual-explanation-of-gpg-subkeys.html
See also https://github.com/dmshaw/paperkey and https://github.com/jonathancross/jc-docs