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I look at the Nix definition for the relevant module as you often need to see what it's actually doing in order to understand it (yes, it's one of those ecosystems).

For example, for the `steam` program (not package - the package is a dummy): https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/p... and then look for "lib.mk".

The key terms don’t change so I usually just grep Nixpkgs in nvim and usually have a lead on where to start. Obviously it’s a bit more work than copy/paste from the arch wiki but generally more popular config changes will have an nixos option available.

try https://search.nixos.org/options .

Or https://mynixos.com/ which is hierarchically navigable. I usually search for a package or setting name and browse around.