Tldr: set the router IP as your dns server, you only need this one.
With a few more words: set the router to use 8.8.8.8 or 1.1.1.1 and then set your computer to use 192.168.1.1 (or whatever your router’s IP is). Hope that is clearer for anyone who needs it.
“I’d rather feed my baby a stranger’s milk that I have no way to test for HIV (etc) than get a vaccine.”
Poor kid is starting out life in hard mode.