You can also do an HN search for it. Here is one excerpt from an HN comment:
"... So for example, a book like "Lisp in Small Pieces", which taught me the concept of Continuations, was considerably hard on the conceptual side. This also took at least a month of conscious connecting the dots between what was in the text, tail-recursion, and those funny callback functions I've been writing in nodejs, before i "Got it".
https://news.ycombinator.com/item?id=2418459