Domain & DNS

Domains and DNS seem simple until something breaks and your site disappears. Understanding how they work prevents problems and unlocks performance improvements most people miss.
This category covers domain registration, DNS configuration, nameserver management, DNS-level security, and performance optimization through DNS. You’ll learn how to set up Cloudflare DNS properly, configure email authentication records, implement DNS failover, and troubleshoot propagation issues.
I also cover domain strategy: when to buy new domains, how to evaluate expired domains, protecting your brand with defensive registrations, and transferring domains between registrars without downtime. These aren’t glamorous topics, but getting DNS wrong can take your site offline. Getting it right can shave hundreds of milliseconds off every page load.