Linux Hint published a tutorial about how use the NixOS Package Manager.

How to use NixOS Package Manager?

NixOS package manager uses a file that has executable or source code like most package managers. The difference is that it places all files in one place called nix-store, keeping your software tidy and easy to recover. Read on and learn how to install and use NixOS on your machine.

How to use NixOS Package Manager? – Linux Hint