Sometimes things come in waves. This week, I had to deal with two sites that had both http:// and https:// versions sitting side-by-side. In other words, typing in https://site.com reveals a working SSL certificate, but just typing in site.com takes you to http://site.com, which is still just sitting there, parallel to the identical SSL version, but without SSL protection of any kind.

Today’s article is on an advanced topic in WordPress development, and is by a distinguished guest and a truly outstanding WordPress developer and educator: Carl Alexander.

If you’re looking to understand the inner workings of WordPress, one of the most important things you’ll need to understand is the distinction between server-side and client-side languages, environments, and processes.