[dehrmann]

A lot of people seem to overdo it, but I'd recommend

- Some sort of assembly

- C

- Java/Kotlin/C#/similar

- Python

- Javascript

- Some Lisp flavor

- Possibly Erlang

- Possibly Rust

This covers a lot of layers of the stack, along with some unique paradigms. I'd use it somewhat seriously for a while (months to year), not just as a toy to learn a language in a week. For a toy, JS and Java are close enough that you might not appreciate that once you get past the syntax, they're radically different.

[agumonkey]

Some logic programming sibling too