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networking.firewall.enable = false;

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# define
mul = { a, b }: a * b

# call
mul { a = 3; b = 4; }
#> 12

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{
  imports = [
    # paths to other modules
  ];

  options = {  };

  config = {  };
}

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{
  imports = [
    # paths to other modules
  ];

  # option definitions
  # ...
}

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:l <nixpkgs.lib>

m1 = { options.foo = mkOption {}; }

m2 = { foo = "hello" }

m3 = { foo = "world" }

(evalModules { modules = [ m1 m2 m3 ]; }).config.foo

#> ["world" "hello"]

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# two channel in one system
let
  stable = import <nixpkgs> {};
  unstable = import <unstable> {};
in
mkShell {
  name = "amazing-shell";
  buildInputs = [ stable.gcc unstable.vscode ];
}