
Websites need to work on a web server so when you want to develop locally, you need to mimic the live environment on your machine.
I use MAMP to do this and it’s available for both Mac and Windows. It’s super easy to install and then you get all the benefits of a live environment with an Apache web server and PHP support.
For now though, it’s just going to be used primitively as a server to display an HTML version of the new website.