DNS Deep Dive: How a Name Becomes an IP
Networking from Scratch (lesson 8) — the DNS hierarchy from root to authoritative, the recursive resolver path, TTL propagation, the records you will actually edit (A, AAAA, CNAME, MX, TXT, SRV), DNSSEC and DoH/DoT in plain English, and the dig and nslookup commands that turn DNS into something you can debug.