If there are things you dont understand, or other sources and ref you need to find TO understand .... you can ask here.
Another problem is the publishing formats. 777 is a good example, some versions come with a full appendix, where Crowley attempts " tell a lot about this is how you do it, and this is the association of that so forth and so fifth, (and tries) telling exactly in clear terms, why they are, they way they are, and where they all originate from. "
But some versions dont have that - just tables showing " It is so ."
Its worse on line now , less and less versions have the full appendix , people want a fast fix, info, parrot fashion learning and no real explanations just quote and 'Crowley (or whoever) said so.'
A different dynamic with Book 4 ( or the more recent Liber Aba ) the beginning lists a lot of preliminary and background reading to be able to fully comprehend what follows. Yes the book may be for 'everyman' , but can one really get Crowley's modern take on psychology / magick, without the relevance that reading Agrippa gives ?
Anyway .... kudos to you for taking it further and WANTING explanations and reasons
But it isnt always the writers fault