Client group management - how does it work?

Recommendations in other blogs.

Then I'd recommend you devote some time to understand the different consequences that are tied to your choice of DNS servers, and how those would matter to you.

If you don't care and just want your Pi-hole to work, pick any of the preconfigured ones.

Thanks, that's ok for me.
Then I go with your recommendation and select preconfigured ones at first and I'm trying to understand the others...

That's a good plan. :+1: