I'm going to be that guy that shills his own stuff. I wrote Programming Bitcoin published by O'Reilly. It has specifics and exercises on all the building blocks that make up the Bitcoin blockchain. You'll learn Finite Fields, Elliptic Curves, ECDSA, Transactions and more. It'll be worth your time since it's a gentle introduction to a lot of cryptographic concepts.
I wouldn't waste time on Web3 or DeFi, though.