@nbathum server outage on the exact evening when I was migrating from #archlinux to NixOS in 2013. :D

Seriously though, not much. Reading Eelco's papers and multi output expressions design documents and literally any #NixFlakes blog post should be a nice way to get solid foundations over a weekend.

As noobs interact more and more with the language, #NixPills is a decent series to build up the language understanding.