if you’re looking for a legit READING app, KOReader is the only way to go. especially if you have an ereader tablet too that uses KOReader too and/or use Calibre. I moved to it from Kindle + Kindle app on Android and I just have no idea what the purpose of Kindle is anymore unless you buy ebooks directly from Amazon. in which case you should… well… stop.
most CS “textbooks” are a scam these days I’m general. a huge red flag when I scan resumes now is actually if they have a textbook published without some sort of advanced degree or qualification to write a textbook. I get resumes of people a year out of college, work a junior position, and have a “Advanced JavaScript” or “JavaScript the not boring way” or “Complete guide to typescript” or some other quirky textbook name. if you actually click into any of these books, they’re complete nonsense written by somebody who just copied another textbook from another idiot who knew nothing. all these people are over confident resume padders. in practice they don’t know shit and didn’t legitimately write a lick of the book. I’ve had some of these applicants claim their books are used by professors too.