No, but check if the browser isn't using other DoH provider. If so just disable it.
Depends on your security model IMHO. If unencrypted dns traffic on your network, or your router being a possible aggretion point for dns requests from devices on your network is fine, then it is a great way to simplify using it for your network.
I imagine it's probably good for 98% of people.
No, but your OS needs to be configured to use the DNS server on your router. Easiest way to do this is with DHCP + NAT rule to ensure all DNS queries are processed by your router.
Why do I need a NAT rule if the computer uses DHCP?
It's not necessary but it ensures that all DNS queries are processed by your router. It could be that there's software that uses a specific DNS server hardcoded to make sure they can avoid your Pi-hole (or alternative solution) to track you.
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
[Matrix/Element]Dead
much thanks to @gary_host_laptop for the logo design :)