In July 2023, I installed NixOS as my daily operating system. NixOS is a Linux distribution that emphasizes a declarative approach to system management. This means you define your desired operating system configuration in a file (e.g., KDE with Emacs 30 and Firefox), and the Nix package manager uses that file to create your OS. Every change generates a new version, allowing you to revert to a previous version if anything goes wrong.