Unlike some years ago when web sites were almost exclusively static, the standard nowadays is to have a feature-rich, dynamic web site. Not many people can build such a web site completely from scratch though, hence the simplest solution to have a dynamic site is to use a script app. A lot of hosting providers offer script installers which can be used to add such an application for each of your domain name or subdomains, so you will not need to install anything manually. The main advantage of using an installer tool is that the scripts are ready to use within a couple of minutes and the copy that'll be installed is already with the settings required for it to run adequately on the specific hosting web server, so you'll not need to change any script or account settings. This way you can effortlessly build one with just a few clicks even when you have never had a website before.