Unlike some years ago when Internet sites were almost exclusively static, the standard currently is to have a feature-rich, dynamic site. Few people can build such a website from scratch though, hence the most convenient solution to have a dynamic site is to use a script application. Lots of hosting companies offer script installers that you can use to add such an app for each of your domain name or subdomains, so you'll not have to install anything manually. The advantage of using an installer tool would be that the scripts are ready to use in a few minutes and the copy which will be set up is already with the settings necessary for it to run adequately on the specific hosting server, so you will not have to modify any script or account settings. This way you can easily create one with simply a few clicks even though you may have never had a website before.