Unlike some years ago when web sites were almost exclusively static, the standard today is to have a feature-rich, dynamic site. Few people can create this kind of site completely from scratch though, so the most convenient solution to have a dynamic site is to use a script app. Many web hosting service providers offer script installers that can be used to add this sort of an application for any of your domain or subdomains, so you'll not need to add anything manually. The benefit of using an installer tool would be that the scripts are ready to use in a few minutes and the copy that will be set up is already with the settings necessary for it to run properly on the specific hosting web server, so you'll not have to modify any script or account settings. This way you can easily create one with just a few mouse clicks even if you have never had a site before.