Who are the best experts for learning about Bitcoin—what it is, how it works, and why people use it—and how can we learn from them efficiently?

Jon Matonis writes a lot about Bitcoin. He is also on the Board Member for Bitcoin Foundation, a body that specialises in "standardizes, protects and promotes the use of Bitcoin cryptographic money for the benefit of users worldwide."

He tweets a lot on Bitcoin as well as writes many articles on issues and the ecosystem of Bitcoin.

Whilst his reading in not in a book shape, reading his articles will make you learn a lot.