All that a flatpak is is a distro-agnostic release of a package. They contain all the binaries and libraries to run on any distro. They’re also sandboxed from the rest of your OS unless you give them permission to interact with it. Being that they contain everything for all of Linux means slightly larger file size, but that’s not so much of a problem as it was in the old days.
I install flatpaks via terminal, same as I do for official repos stuff and the AUR. I was never a fan of GUIs for really anything on Linux other than my file browser, but especially not for updating or installing packages. There’s too many prompts and dependencies.


All good! You sound like you’re on the right path. I have like 3 or 4 flatpaks installed hahaha