Algorithmica – open-access webbook dedicated to the art and science of computing
en.algorithmica.org
en.algorithmica.org
Static B-Trees: A data structure for faster binary search - https://news.ycombinator.com/item?id=30376140 - Feb 2022 (44 comments)
I particularly enjoy the detail-oriented yet approachable content (to someone like me that does not have a CS background).