Not sure if that helps, but if you’ve never programmed before, I definitely recommend Automate The Boring Stuff With Python by Al Sweigart. The book is free to read, plus the author is on Reddit (u/alsweigart) and releases free signups to the Udemy course based on the book each month.
Lurking through communities related to my favorite literary genres while having Z-Lib is like walking into a candy store as a 10-year-old and being told that you can get all that you want free of charge. Of course curating a library is enjoyable lmao
I actually like the download limit that Z-Lib has for regular users. If you use it up, it moght be a good time for you to go actually read what you have downloaded.
Privacy versus convenience… For what I know, the most common solution to your concern would be to setup a Calibre server and access it via your Android devices. But that’s obviously a tad more complex than uploading EPUBs to Google Books.