One language where you can get a proper segfault. C, C++, maybe Rust. Knowing C is always good as it’s fundamental to many other things. Python. (because ML/nu

One language where you can get a proper segfault. C, C++, maybe Rust. Knowing C is always good as it’s fundamental to many other things. Python. (because ML/numerics/data science/web servers/various automation tools) Then again, to understand CPython you need to know C. One functional language, to know how it works. Maybe Haskell, or Ocaml, or F#. JS is always a bonus these days I guess, but it’s more about knowing browser stuff than the language itself.