So I’ve not seen it mentioned before, but if you want to start getting into private trackers, you can check out the private tracker general thread (/ptg/) on the /g/ board of 4chan
4chan is what it is, but there is a lot of good info in just the OP (please read the OP entirely before posting, I beg of you), and that’s how I got into private trackers
PS: you wont get any invite, dont ask for them
They had a very rough start and then a rough go at things for the first year or two. They’re fine now but it was a massive clusterfuck for a while.