I spent a lot of time locked in the library, when I was a kid. Just to be clear, I don’t mean visiting the library, or absorbed in reading at the library, or gee, I was one of those kids who always begged their parents to take them to the library. I mean locked in.
A content management system is basically a computer program that manages content, and typically the content of a website. So… well… WordPress springs to mind. There are plenty of choices out there. So, once upon a time, I had some grade school teachers who decided (or possibly were told) that computers were the wave of