Does anyone have any advice on tackling subjects like these for someone who hasn't done any math since high school more than a decade ago (and has forgotten it)?

But this is the first guide that I know the material! I have “learned computer science” (somewhat). And I have to say it has propelled Beej’s other guides to the top of my reading list. The subchapters I skimmed and their content are just so relevant and I know many new and experienced devs (myself included) who would still benefit greatly from reading this. Just exceptionally well done.