Seconding what @LeeTalbert says about using the terminal. I believe that if users new to Linux expecially OMLx (OpenMandriva Linux) start with software searching, installing, removing, and upgrading system this is an excellent and easy way to get used to and comfortable with using the cli (Command Line Interface) or terminal (Konsole in Plasma desktop).
dnf is the command line package manager used by all OMLx versions or branches.
How To use dnf (any version of OMLx)
Repositories are where the .rpm files for all OMLx software reside. Understanding our repositories and how to edit them to your needs: