Unlike some years back when sites were almost exclusively static, the standard currently is to have a feature-rich, dynamic site. Not everybody can create this type of website from scratch though, so the simplest solution to have a dynamic website is to use a script application. A lot of website hosting companies offer script installers which you can use to add this kind of an app for each of your domain or subdomains, so you'll not need to install anything manually. The advantage of using an installer tool would be that the scripts are ready to use within a couple of minutes and the copy that will be installed is already with the settings required for it to run adequately on the specific hosting web server, so you'll not need to change any script or account settings. In this way you can easily create one with just a couple of clicks even if you have never had a website before.