Common record types:
- A: Points a hostname to an IPv4 address.
- AAAA: Points to an IPv6 address.
- CNAME: Alias one hostname to another.
- MX: Mail exchange servers (priority matters).
- TXT: Verification & SPF/DMARC policies.
Propagation typically 5–30 minutes (occasionally up to 24 hours). Lower TTLs help during migrations.