What is RPM? RPM stands for Red Hat Package Manager. It was developed by Red Hat that found widespread acceptance in many Linux distros. This is a command-line tool that you can use to install, delete, update packages in your OS.
After installing Fedora Server, you will be presented with a black shell screen for logging in instead of a graphical login screen. That is because you have installed Fedora Server and not the Fedora Workstation and what you have now