I used to use thepiratebay.org, but recently it seems the quality of the site has degraded.
I sometimes also use 1337xx.to , but that site seems to have a very small selection.
Note that I couldn’t find an answer to this question in the wiki + meathread, so if the answer is already there, please direct my attention to it 🙏🏴☠️
I like to use rutracker.org. The tracker is public but the search is behind a registration form. Based on my experience it has some content I was unable to find on English trackers. Additionally, InsaneZemRes (a no compression repacker, good if internet speed/bandwidth aren’t of a concern) uploads new releases to there instantly, so very comfortable if I’m looking for a game that came out recently.
In case I can’t find what I’m looking for on rutracker, torrentgalaxy.to is a good alternative. They have a lot of the RARBG torrents and I think that’s where most ex-RARBG users migrated.
Apart from private trackers, rutracker seems to be the best for lossless movies in 1080p. Big selection of blueray remuxes/rips which are often missing from the other public indexers, likely because causal users prefer 2gb files to >20gb.
Rutracker is great for CAD and other engineering software.