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 site completely from scratch though, therefore 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 app for any of your domain or subdomains, so you will not need to add anything manually. The advantage of using an installer tool would be that the scripts are available to use in a few minutes and the copy which will be installed is already with the settings needed for it to run the way it should on the specific hosting web server, so you'll not have to alter any script or account settings. This way you can effortlessly build one with only a couple of mouse clicks even if you have never had an Internet site before.