The answers to all those questions are "it depends". There's a few thousand libraries, those obviously refer to each other.. Some have readme files and that's e

The answers to all those questions are "it depends". There's a few thousand libraries, those obviously refer to each other.. Some have readme files and that's enough, some have full documentation "books", some have comments in the code and that's enough. We don't mandate a company wide development process, so each team and groups can choose their own process and how they track their stuff. We do have automation and tooling to keep track of things though.