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Thanks. Can you recommend some free resources to learn from?

Crafting Interpreters is probably the gold standard. They do phase 1 in Java and phase 2 in C but most of the code is pretty translatable.

http://craftinginterpreters.com/

Seconding this recommendation. Bob (author) did such an amazing job of that book. I proudly display it in my office. The illustrations alone are worth the cost.

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