This is my personal NixOS / Nix-Darwin / Home-Manager configuration. It always is work in progress and is constantly changing. It should not be used as a reference for how to do things the best way.
/hosts- System configuration for both of my hosts. (Currently one for NixOS, one for Nix-Darwin)
/modules- NixOS and Nix-Darwin modules.
/home- Home-Manager (per-user) modules.
/common- Common configuration data shared between the sibling directories.
/darwin- Modules specific to Nix-Darwin.
/nix- Modules to configure Nix and Nixpkgs.
/services- Modules for services. (e.g. systemd units)
/system- Modules for system-related configuration. (e.g. bootconfig, networking, ...)