To ensure games run well on Linux either via Native Linux builds or Windows games with Proton, part of the magic is in the Steam Linux Runtime. A new version of it, the Steam Linux Runtime 4.0 was recently put up with some pretty big changes.
What’s the point of it? It ensures Steam and games run through Steam on Linux work properly across all the many different Linux distributions. Another secret Valve sauce for Linux. Well, not secret at all but you get my meaning I’m sure.
i recommend LXQT over LXDE cause its like the spiritual succesor,i think lighter and it has Wayland
but you can use whatever you like
I’m not using either of those. I’m using the LMDE default, Cinnamon.