Update 'selected/http_to_phy.md'

selected/http_to_phy.md

@@ -65,18 +65,19 @@ Good learning resources for IP:
 So, how do you *actually* send that cat though? How do you send a real packet yourself?
 It's time to make that theory stick.
 
-Some good outlets for exercises:
-- https://beej.us/guide/bgnet/html/ [NOTE(hayden): This seems like an excellent resource!]
-- https://github.com/shuveb/zerohttpd [NOTE(hayden): If we can provide a brief description of the different folders in this repo, that might be helpful]
+[Beej's Guide](https://beej.us/guide/bgnet/html/) is probably the best place to start.  [NOTE(hayden): This seems like an excellent resource!]
 
 ## DNS -- Wait, how do I get an IP?
 The last really important bit you need to know is DNS. The job of DNS is to help you find IP addresses for domain names, 
 like "handmade.network".
 
-Good learning resources for DNS:
-- https://wizardzines.com/zines/dns/
+Here's a great tool for playing with setting up DNS records yourself. Don't worry if you don't 100% get it,
+there's a bunch of great resources below for grokking the details
 - https://messwithdns.net/
-- https://www.cloudflare.com/learning/dns/what-is-dns/
+
+DNS detailed:
+- https://wizardzines.com/comics/life-of-a-dns-query/
+- https://jvns.ca/blog/2022/02/01/a-dns-resolver-in-80-lines-of-go/
 
 <-- Link to expanded, less curated library of topical info -->  
 <-- Branch into DNS over HTTPS / DNS Lookup Security via link here -->