Unlike some years ago when sites were almost exclusively static, the standard currently is to have a feature-rich, dynamic site. Not everybody can build such a website completely from scratch though, so the simplest solution to have a dynamic website is to use a script application. Many web hosting service providers offer script installers which you can use to add this type of an application for each of your domain name or subdomains, so you will not need to add anything manually. The key advantage of using an installer tool would be that the scripts are ready to use in just a couple of minutes and the copy which will be installed is already with the settings needed for it to run adequately on the particular hosting web server, so you'll not need to change any script or account settings. In this way you can quickly create one with simply a couple of mouse clicks even though you may have never had a site before.