super simple setup guide

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+---
+title: setup nixos
+weight: 5
+---
+{{% hint info %}}
+This is ***not*** intended to be a NixOS configuration guide.  
+For berevity, I assume you have a fresh NixOS installation.
+To learn Nix and NixOS, [read this guide](https://nixos-and-flakes.thiscute.world/).
+{{% /hint %}}
+
+{{% hint warning %}}
+This guide is flake agnostic.  
+I use flakes for my personal setup, but everything in the [self-sufficiency notes](/theses/self-sufficiency/intro-nixos) uses classic modules.  
+You can find my setup [here](https://code.aethrvmn.gr/configs/nix.git).
+{{% /hint %}}
+
+With a fresh NixOS installation, the `configuration.nix` should be in `/etc/nixos/`. Inside that directory, we can make a folder `modules`
+```sh
+$ mkdir modules
+```
+and make a file `default.nix` inside that folder.
+```sh
+$ touch modules/default.nix
+```
+then we can just add that to our `configuration.nix`
+```nix
+# /etc/nixos/configuration.nix
+#...
+imports = [
+  #...
+  ./modules
+  #...
+];
+#...
+```
+Inside this `modules/` folder is where we will write all the services.