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Windows 7, 8 and 8.1 support will end tomorrow (January 1st 2024)
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Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
Just install Linux mint and install flatpak steam. I think minimal distros are better in general but they do require more familiarity with terminal usage which can be harder for newer users (I personally use void). So mint is a very solid distro that has a good amount of support in older hardware and stuff, no need to think hard basically