The Hidden Wiki
Note: I was paid for my endorsement of this website.
The hidden wiki has undergone an update to an OnionV3 service and admins have asked administrators of clear-web sites to make reference to their new address so that the word gets out. The Hidden Wiki is actively maintained and it is a great way to discover new TOR hidden services. They also point to various articles about maintaining operational security on TOR. If you are at all interested in the dark web, op-sec or TOR I recommend you to check out this site.
The new address of the service is zqktlwiuavvvqqt4ybvgvi7tyo4hjl5xgfuvpdf6otjiycgwqbym2qad.onion.
Thanks for reading!