Bitcoin & Cryptocurrency Technologies by Jameson Lopp also great read and it's available for free at
https://lopp.net/pdf/princeton_bitcoin_book.pdf. The book was released in 2016, so it's a bit oudated.
If you want to go deeper, you should know that it is not going to be easy if you don't have good knowledge of: computer science, programming languages, networks, networks security, cryptography...
Don't forget game theory
