DNS

Every domain has a set of DNS records, usually managed at your registrar. They tell the internet where your website lives (the A record) and where your email goes (the MX record). TXT records handle the rest — verification codes and email security.

Most of the time it’s set once and left alone. You’ll touch it when you switch hosting, set up business email, or connect a tool that asks you to “add a record” somewhere.

Two rules I give every client. Screenshot your existing records before changing anything. And don’t panic when a change doesn’t work instantly — DNS updates can take up to 48 hours to spread.