Hosting a website on a Linux system usually involves multiple software packages that operate together to deliver a web browsing experience to potential viewers. For example, it's common for PHP to dynamically render web content but retrieve data from a database. These are two separate components and they must both be installed to present a website as intended.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-install-xampp-on-ubuntu-linux