What are your favorite free resources for understanding how DNS works?

[vale]

I have been curious about how DNS works.
My goal is to go deeper than "it resolves names to IP addresses".

That led me to wondering what resources may know of that have increased your understanding of how DNS works.

So, if you feel like doing so, post a link or short description of something! You might also share your favorite CLI tools for exploring the protocol.

Thank you!

I just learned about the command host which I found helpful for a brief summary of where a domain resolves to.
I also found "A Warm Introduction to DNS": https://powerdns.org/hello-dns/ a helpful technical deep-dive.

[Patrick M. Hausen]

Borrow this book from a public or uni/school library:

https://www.oreilly.com/library/view/dns-and-bind/0596100574/