Everyone can create a .torrent file. While you create it you can enter one or multiple URLs of trackers that everyone connects to when they open the torrent fi

Everyone can create a .torrent file. While you create it you can enter one or multiple URLs of trackers that everyone connects to when they open the torrent file. (Or none, there is also a decentral why of doing torrents) Clients just send a hash to the tracker URL and get a list of urls back with other people who send in a request with the same hash. The tracker does not care how you share those torrent files. I think it's just a list of hashes and URLs. This might not be 100% correct, but I hope you better understand it :)