Ah, glad you came back to look at it.
I just realized I forgot something rather important. I put data structures and database schemas at the top for backend systems, but I failed to mention SQL as a language. If you’re going to be working on any data systems, you’ll need to know at least up to joins, subqueries, and/or CTE’s.
I’d put SQL even before Elixir because it’s generally applicable. Anyway, good luck…
