Installing software can be done via gui (graphical user interface) like pamac and gnome-software explained here. But it can be done via terminal as well. Our Arch fun starts on the AUR or Arch User Repository. Check out what other people find great. Votes...
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7 – Installing software with pamac or gnome-software any desktop
In ArcoLinuxD we install all our software with scripts. Scripts can be easily edited. Delete lines, add lines. Install the software YOU like. That must be the first step to install the applications you do want. But eventually you will want to try out new applications...