dnfcommand is a Linux package manager on RPM distributions, including Fedora, CentOS, RHEL, OpenMandriva, and Mageia. The more you know about how your package manager works, the easier it is for you to install and query applications when necessary. Even if you're not a regular
dnfuser, it can be useful to know it when you find yourself interfacing with an RPM-based distro. This cheat sheet is handy to have nearby.