Perhaps it may not be a bad idea to dual boot Arch and SteamOS or BazziteOS until you get the hang of Arch. While Arch is a very flexible system, accidents happen, and it’d be a shame to lose game progress due to system breakage.
And fyi, Konsole is simply a terminal application for your command line. Personally I don’t really mess with flatpaks, and I suggest getting familiar with pacman (Arch’s package manager) and the AUR.
https://store.steampowered.com/steamos/download/?ver=steamdeck
It’s a recovery image, but can be used for a fresh PC install.