I have two criteria: - languages that are foundational or continually in demand: C, C#, Java, Golang, Python, Ruby, JavaScript - languages clearly gaining tra

I have two criteria: - languages that are foundational or continually in demand: C, C#, Java, Golang, Python, Ruby, JavaScript - languages clearly gaining traction: Rust, Elixir, Typescript, etc The languages listed and the categories I listed aren’t exhaustive, just the ones I thought of. I try to keep some of the foundational ones fresh-ish. Then I’ve got a couple of the interesting ones fresh just because I find the space interesting. Right now, my foundational languages are C, Golang, and Ruby. Exciting ones are Rust and Elixir. Beyond that, I don’t try too hard. Just want to keep familiar with ideas.