DNS Records Explained: A, AAAA, CNAME, MX, TXT, NS — and How to Debug Them
What each record type actually does, why a CNAME can't live at your apex, why MX must never point to a CNAME, why 'DNS propagation' is mostly a myth about caching, and the dig-based debugging method that finds the real answer in five minutes instead of waiting 48 hours.