DNS guides
Plain-English DNS guides, with links to the checks that go with them.
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DNS
CAA records: control who can issue your certificates
How CAA records limit which certificate authorities may issue certificates for your domain, how to write them, and how to avoid blocking your own renewals.
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DNS
DNS record types explained: A, AAAA, CNAME, MX, TXT and more
What each common DNS record does, from A and CNAME to MX, TXT, NS, SOA, CAA and PTR, with a short example of each and the mistake people most often make with it.
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DNS
Changed your DNS? Why updates take time (TTL explained)
Why DNS changes are not instant, what TTL means, how to plan a change so it takes minutes rather than hours, and why nameserver moves take longer.
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DNS
DNSSEC explained: what it protects and how to spot a broken setup
What DNSSEC protects against, how the chain of trust from the root to your domain works, and how to spot and fix a broken setup after a DNS provider change.