YOU'RE CLOSER THAN YOU THINK: THE ONLY 6 DNS CONCEPTS YOU REALLY NEED

Summary from the TLDR newsletter

There are only six core concepts (A records, CNAMEs, MX records, TXT records, NS records, and TTL) needed to understand DNS. This article looks at these essentials, which will cover most DNS needs. It includes a table that contains a complete list of DNS functionality with descriptions.