I'll be the oddman out and suggest paying the one-time $20 registration fee for iptorrents.com

It's simple,quick and easy. No need to worry about getting invited/waiting for open signups. Their retention and library is huge. Speeds are also wonderful as a lot of people are seeding from seedboxes.. I'm on most cabal/top private trackers and I still use it more than anything. Been using private trackers for 6-7 years now.

It's got everything you would ever need as it's a "general tracker" so they have games,movies,tv,software etc. If you don't want to pay then checkout: https://opentrackers.org/ for trackers that are having public signups.

myanonamouse.net, a private tracker that focuses on ebooks and audiobooks, is a pretty good place to get started. Registrations are closed, but twice a week they offer interviews to join. The interview is not hard, you just need to be able to answer a short quiz about the rules.

Once you're in it's really easy to maintain your ratios and there is a lot of freeleach content.

I've found audiobooks there that I can't find anywhere else.