if you're interested in Rust this might help. It's intended to be an introduction to the tokio async runtime for Rust by having you implement a minimal redis.

https://tokio.rs/tokio/tutorial/setup

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I have done something similar with ruby, this is a great book: https://workingwithruby.com/downloads/Working%20With%20TCP%2...

I would recommend doing C at some point in your career, nothing comes close in terms of forcing you to understand the hardware you are using.

C/C++ is two languages, C and C++.