The Bitcoin Standard by Saifedean Ammous
Mastering Bitcoin and The Internet of Money by Andreas Antonopoulos
Crypto assets by Chris Burniske & Jack Tatar
Broken Money by Lyn Alden, and Digital Gold by Nathaniel Popper.
Each of them gave me a different lens. Some helped me understand the nature of money, some went deep into the technical side, some broke down the financial system, and others told the history of Bitcoin like a living story. At one point, I believed I already had a fairly complete foundation in this space.