I love nix and NixOS, but yes the documentation is incredibly insufficient. I’d recommend a normal distro + the nix package manager first for a personal laptop. You have be ok occasionally taking a detour to learn how to build some random program from source in a sandbox with no networking every once in a while so it’s kinda clunky as a daily use OS imo. It shines on servers though
Not exactly “memory address 0”; there be dragons there. https://c-faq.com/null/index.html