Comment by mk12

I've slowly been working through SICP, currently on chapter 3: https://mk12.github.io/sicp/. There are lots of other websites, but what sets mine apart is the exercise solutions are written as modules with explicit dependencies on other parts of the book, and they are tested in three Scheme implementations. I describe my approach for this here: https://mk12.github.io/sicp/exercise/language.html.