Unlike some years ago when sites were almost exclusively static, the standard nowadays is to have a feature-rich, dynamic website. Few people can create such a web site from scratch though, therefore the simplest solution to have a dynamic site is to use a script application. Many hosting providers offer script installers that you can use to add such an application for each of your domain 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 just a few minutes and the copy that will be set up is already with the settings needed for it to run correctly on the specific hosting web server, so you will not have to change any script or account settings. That way you can effortlessly build one with simply a couple of mouse clicks even if you have never had a website before.