You’re welcome Mark! I have to agree with you, the documentation is very beginner-friendly at all. I would say, please don’t feel ashamed of asking questions here, I think it should be the opposite actually. Basic questions on the forum reflect badly on the state of the documentation itself, or on the discoverability of basic information.
About the show rules combination, I think it’s best to create one rule per document you are writing. Styling composability is ambiguous to the user, especially when loading packages, etc. This is a pain point of Typst.
I believe you would find the answers at Which show rule takes precedence? interesting. As for the question itself, could I trouble you to create a new topic in Questions?