Bitcoin and crypto are not the same thing. This is an important point. Yes, Bitcoin is a cryptocurrency, but do not be misguided and lump Bitcoin with all other cryptocurrencies, (known as crypto or alt coins). Once this is understood, everything becomes much clearer about Bitcoin.
Satoshi Nakamoto's original paper is still recommended reading for anyone studying how Bitcoin works. Bitcoin: A Peer-to-Peer Electronic Cash System. The paper that first introduced Bitcoin Download the PDF: https://bitcoin.org/bitcoin.pdf
There is a very good free book. This accompanies the Princeton University Bitcoin and Cryptocurrency Technologies Online Course.
"Bitcoin and Cryptocurrency Technologies" provides a comprehensive introduction to the revolutionary yet often misunderstood new technologies of digital currency.
Welcome to the blog all about Bitcoin, Blockchain, Crypto and Digital Assets. The aim is to provide interesting links and articles to help learning within the industry/arena/space.