Switching host or nameservers without breaking your email: a checklist
Moving host or changing nameservers can quietly break your email. Here's the order that keeps it working: copy the DNS zone, lower your TTLs, move mailboxes first if you need to, then switch and test from the outside.
How to add a CDN to any WordPress site (and what it actually fixes)
What a CDN really speeds up on a WordPress site, how to set up Cachper step by step (DNS records, SSL and the plugin), what stays out of the cache, and how to check it's working.