It is unfortunately a Reddit link: https://www.reddit.com/r/usenet/wiki/index

My recommendation is to subscribe to Eweka when it's on promotion. I pay around $3/month since I pay for a year up front, and it recurs for that price.

Secondly, pay for NZBGeek.

Between those two you're mostly set. If you really start using your subscriptions a lot, you can look into alternate backbones and indexers.

You can automate all of this with Radarr and Sonarr. They are my favourite pieces of software ever.