I used to visit an specialized private tracker that went offline, deli.sh, it's had only food content, like video courses and a lot of books. Everything had at least a couple of seeders, so even that ultra rare French language pastry book was available to download. My girlfriend, now wife, was on cooking academy and I downloaded a lot of books and courses for her that would be unavailable anywhere else on the internet. I don't think you can really have that kind of collection on a public tracker.