Long time ago I was stuck at the airport and I end up writing a interpreter in Python. I stop the project at arithmetic, so, basically a fancy calculator. After that I saw a really interesting video about Shunting Yard algorithm, so I gave that a got as well [1]. At some point, I want to try to write a programming language, I know a little bit about assembly but it is most theory; haven't done much programming using it (only basic stuff, back in college) but I find it fascinating.

1 - https://github.com/victorqribeiro/shuntingYard