Unlike some years ago when Internet sites were almost exclusively static, the standard these days is to have a feature-rich, dynamic web site. Few people can create this sort of web site completely from scratch though, so the simplest solution to have a dynamic site is to use a script app. A lot of hosting providers offer script installers you can use to add this kind of an application for each of your domain or subdomains, so you will not have to add anything manually. The best thing about using an installer tool is that the scripts are ready to use within a few minutes and the copy that will be installed is already with the settings needed for it to run efficiently on the specific hosting server, so you'll not need to change any script or account settings. In this way you can easily build one with simply a couple of clicks even if you have never had an Internet site before.