Some books are essential in the cryptocurrency world among them : "Cryptoassets" by Chris Burniske, "La Revolution Blockchain" by Philippe Rodriguez "," Blockchain "by Mélanie Swa," The Internet of Money "by Andreas Antonopoulos, and of course the key White papers of Satoshi Nakamoto (founder of Bitcoin) and Vitalik says Buterin (founder of Ethereum)
But one bad thing about book in crypto is that they are not updated which mean that every news hasn't got place for itself there, so internet is better source of information about something which is still developing for me.