Most mainstream distros will work with pretty much all of the software suggestions. I tend to avoid recommending Ubuntu these days as Canonical have some stubborn ideas regarding things (snaps should have been shelved long ago in favour of flatpack), that said, PoP-Os is an excellent choice for buntu based without the snaps.
Video,editing: shotcut is pretty good alongside Kdenlive. For anyone working with audio, Audacity is a definite must have for track/sample editing and effects. Whilst Ardour is an extremely capable DAW, there are others you might want to check out, LMMS is a nice sequencer (fruity loops) DAW for example. On the professional side there is Bitwig (never used it but heard good things about it) and my personal favourite Reaper.
Many steam deck users report that using moonlight as a client works great with nvidia hosts. It utilises nvidia gamestream protocol which is built into the nvidia drivers on Windows/Linux, basically removing the need to mess around with encoder settings.