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The Redis challenge was extremely fun. I ended up having to read Redis protocol specification doc pretty carefully in its entirety! The result felt like lightly-guided independent study, if that makes sense. (Which, again, was lots of fun)

I'm learning about how Redis works under the hood, system calls, socket programming in Python — something I've never done before

I've started the Docker challenge, enjoying it a lot so far. Just the right level of guidance, helpful and still gives you a lot of freedom to explore and learn for yourself.

My favorite way to master a language.

Found out from a colleague. It has you build your own version of things like Git and Docker from scratch. A cool way to build a stronger mental model of how those tools work.

The Docker challenge helped me dive into its internals, through *actual* practice. Super fun.

I was really impressed that they support Haskell, and will probably usethis to learn Rust! The git-based workflow is :chefkiss:

The instant feedback right there in the git push is really cool. Didn't even know that was possible!