Unlike some years ago when sites were almost exclusively static, the standard nowadays is to have a feature-rich, dynamic site. Not everybody can create this type of website from scratch though, so the handiest solution to have a dynamic site is to use a script app. A lot of website hosting service providers offer script installers which you can use to add this type of an app for each of your domain name or subdomains, so you will not have to add anything manually. The main benefit of using an installer tool is that the scripts are available to use in a few minutes and the copy that will be set up is already with the settings needed for it to run the way it should on the particular hosting server, so you'll not need to modify any script or account settings. That way you can easily create one with simply a couple of mouse clicks even if you have never had a website before.