The records you will actually encounter.
A RECORD
Points a name to an IPv4 address. Your domain's A record points at your hosting server. Subdomains each have their own.
AAAA RECORD
The same, for IPv6 addresses.
CNAME
Points a name to another name rather than an address. Used for subdomains and for third-party services that ask you to point something at their hostname. A CNAME cannot coexist with other records for the same name.
MX
Directs email for the domain to a mail server. Priority matters, and the lowest number is tried first. Getting these wrong stops mail arriving.
TXT
Holds arbitrary text. Used for SPF, DKIM and DMARC, and for verifying ownership with services such as Google.
SRV
Used by some services, particularly VoIP and chat systems.
NS
Delegates a zone or subdomain to other nameservers.
TTL
How long resolvers cache the record, in seconds. Lower it to 300 before planned changes so they take effect quickly, then raise it again.
Where to edit them depends on where your nameservers point.
