I'd encourage you to dig into how modern JS interpreters work (they aren't really interpreters at all anymore!) I feel like it has helped me conceptualize how code runs on a whole new level and I gained a ton of respect for where the ecosystem is today. There's a book in the .NET world called CLR Through C# which explains in extreme detail all the inner-workings of the .NET runtime and it pushed me to become a better coder more than any other book has. Unfortunately, I am not sure how relevant it is now that we have .NET Core, but it's still pretty mind-boggling the amount of thought that goes into every aspect of a programming language and how much we have left to learn.
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