@pcrock No yeah, maybe I wrote it bad, QGIS works very well, it's ArcGIS that is basically impossible to install.
So I can't really follow my GIS lessons and I can't compare the two... I'm learning QGIS with online tutorial, so far it's been a great experience!
@arteteco Wow, really? I figured QGIS would work better on Linux than Windows.
Reading their download page for Debian, it does sound a bit... unstable. Did you try installing the Long Term Support version (3.10 Coruña)?