The words you will encounter.
- REGISTRAR: where the domain is registered
- REGISTRY: the organisation running an extension, such as .com or .ng
- NAMESERVER: a server answering questions about a domain
- ZONE: the set of records for a domain
- AUTHORITATIVE: the servers holding the real records
- RECURSIVE or RESOLVER: a server that looks answers up and caches them
- PROPAGATION: old cached answers expiring, not a distribution process
- TTL: how long an answer may be cached
- RECORD: a single entry, such as an A or MX record
- A RECORD: a name pointing at an IPv4 address
- AAAA RECORD: a name pointing at an IPv6 address
- CNAME: a name pointing at another name
- MX: where mail for the domain should go
- TXT: arbitrary text, used for SPF, DKIM and verification
- NS: which nameservers are authoritative
- SOA: administrative details about the zone
- GLUE RECORD: the address of a nameserver on the domain it serves
- DELEGATION: handing a subdomain to different nameservers
- DNSSEC: cryptographic signing of DNS responses
- PTR: reverse lookup, address to name
WHICH MATTER MOST
A, MX and TXT. Those three cover almost everything you will change.
