It’s a very steep curve to start, with some additional minor steep parts along the way, but it’s not a long curve. Once you got the core concepts and the basic language constructs, you’ve learned most of what you’ll ever need.

Two nice resources: search.nixos.org is super handy, and you can search GitHub with language:nix and a search term to get tons of examples from other people.

Oh, and nix and just is actually a pretty common combo!