I readable textbook on the workings of Bitcoin and related technologies. The information is still relevant to Bitcoin (minus the lightning network upgrade), but only lightly covers other crypto technologies that have risen since the publishing of this book. Overall, I recommend!

Book: https://www.amazon.com/Bitcoin-Cryptocurrency-Technologies-Comprehensive-Introduction/dp/0691171696

Class: https://www.coursera.org/learn/cryptocurrency

This video is also available on YouTube and BitChute.