Soliciting feedback from the community to improve my configuration.nix

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Hello
Your config is looking good. Especially that your packages are all that neatly organized.
But there are some things you can still do.

First of all you can write your config in different files. For example one with your packages, one for your boot config, etc.
For that create a new file like systemPackages.nix and at the start of that file put in this:

{config,pkgs,lib,inputs,...}:
{
#config
}

Than you can just import them in your configuration like the hardware-config in the import option.
With that you have a nicer overview over your system. Especially if you add more your config will still be readable.
For example my /etc/nixos looks like this:

├── configuration.nix
├── flake.lock
├── flake.nix
├── hardware-configuration.nix
├── home.nix
├── LinuxCommandSheet
├── png
│   └── wintergrass.mp4
├── programs
│   ├── bash
│   │   └── bash.nix
│   ├── btop
│   │   └── btop.nix
│   ├── emacs
│   │   └── emacs.nix
│   ├── fastfetch
│   │   └── fastfetch.nix
│   ├── ghostty
│   │   └── config
│   ├── gnome
│   │   └── gnome.nix
│   ├── hyprland
│   ├── kitty
│   │   └── kitty.nix
│   ├── lvim
│   │   └── config.lua
│   ├── neovim
│   │   └── neovim.nix
│   ├── starship
│   │   └── starship.nix
│   ├── tschuss
│   │   └── default.nix
│   ├── vscode
│   │   └── vscode.nix
│   └── zsh
│       └── zsh.nix
├── scripts
│   └── mpvpaper
└── system
    ├── audio.nix
    ├── boot.nix
    ├── displaymanager.nix
    ├── firewall.nix
    ├── nvidia.nix
    ├── programs.nix
    ├── services.nix
    └── stylix.nix

The programms directory is for my home-manager. All the configs in there are imported by my home-manager.
The png directory is for my background (currentyl a video).
The scripts directory is for scripts.
The system directory is for my configs that are imported by my normal configuration.nix.

The second thing i recommend you doing is Flakes and home-manager. I know that these a a bit complicated for a beginner, but really pays out in the long run. The best feature of flakes is, that it locks your package versions. Means if you setup your config on another machine all the versions will be the same. Also you than don’t need to use channels anymore, which for me are a bit annoying.
Home-Manager is really great when configuring programs like bash, kitty, etc. They offer you much more options to customize your system. Especially with hyprland.
A great source to get started is the series by Vimjoyer:

The third thing I can highly recommend you doing is stylix. For stylix you don’t necessarily need a home-manager. But for customization it is just fabulous. Vimjoyer also did a video on that.

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