Some usefull onion adresses

DuckDuckGo

http://3g2upl4pq6kufc4m.onion/

Wasabi Wallet

http://wasabiukrxmkdgve5kynjztuovbg43uxcbcxn6y2okcrsg7gb6jdmbad.onion

Wasabi Wallet is a Bitcoin wallet that not only hides all your data in the Tor Network but also allows you to ‘join’ your transactions with others to increase your anonymity. This makes it incredibly difficult to find out who you are paying.
The process costs a fee, but unlike with other ‘tumbler’ or ‘mixing’ services, there is no risk that Wasabi or any of its users could scam you out of your coins.

Riseup

http://vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd.onion
Riseup is a volunteer-run email provider for activists around the world.
Founded around 1999 by activists in Seattle, it has since grown to over six million users worldwide.
not only runs Onion services for its website but all its email and chat service

and much nore see:
https://www.expressvpn.com/blog/best-onion-sites-on-dark-web/