Originally Posted by Squidgy

Libgen/zlib (zlib is basically an expanded fork of libgen) are pretty good for books - only issue is restrictions on downloads (and they've been getting harder to access due to the guberment cracking down on evil pirates). It probably has a lot of content others don't- MAM for example has a "banned authors" list. A combination of ABTorrents, MAM & Zlib will probably cover your bases.

In fact I've been already using sites such as zlib, libgen... for many years. But I was looking specialized torrent trackers with more or newer content.
I've read about bitme, bitspyder, learnflakes and myanonymouse. Which one has more content? I'm looking for academic books, IT, science...

I'm not a member of bitme, bitspyder or learnflakes so I can really comment on them. I know learnflakes specialises in IT related content so you might find more stuff there that interests you. And I believe bitspyder has a lot of "certification" content like online courses that you might find useful- but zlib will have the most content in general, it might be harder to find the relevant content though (eg you might find exaclty what you were looking for except it was made for Windows 10 when you need 11) I'm on MAM and ABT and there's been a few things I couldn't find on either if them but could find on zlib.
Nothing that I haven't found on zlib that was on either ABT or MAM.
Learnflakes and MAM Is probably where I would try to get into if I were you, LF for the specialization and MAM for the community (maybe you can get what you need via request) as well as MAMs recruitment threads might help you get into other trackers that could help

Originally Posted by dovesnewton

Generally for textbooks you use "https://z-lib.is/" is the main area people get textbooks.

suspended here by FBI, used libgen

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also there were great tool called "Hatt" for books and audiobook

it`s located on GitHub