

One way to find a private tracker is to monitor /r/OpenSignups. I would suggest using the RSS feed so you can get notified of new posts. Most trackers are only open for a short time. Don’t bother with the new trackers that constantly pop up, they don’t have enough users to maintain a good ratio easily. Be sure to get into TorrentLeech next time they open signups, that’s a good general purpose tracker and it’s very easy to maintain your ratio there.
Another way is to get into MyAnonaMouse, Orpheus, or Redacted through an interview and use the invites forum to get into other trackers.
There are unofficial qBittorrent search plugins for some private trackers. If you can’t find a plugin for the tracker you want, you could always use Jackett.
There’s NetSurf, which is really lightweight for a graphical browser. There’s also Falkon and Otter Browser. They are more capable, but use more resources.