"The Little Bitcoin Book" is a book you can safely gift to non-crypto-pilled friends. It is a complete primer on the whys and whats of the Bitcoin protocol. Everything that you need to know is contained within this short title.
I'm disappointed that the authors didn't talk about Ethereum in the book, yet it's the little Bitcoin book, not the little Cryptocurrency book. It covers everything from why anyone would need a cryptocurrency to the future of Bitcoin. Some aspects are questionable from an economic standpoint (e.g., why Bitcoin price would go one way or another). Yet, the narration is cohesive and easy to follow.
Feel free to recommend this book to anyone curious about cryptocurrencies yet knows nothing about them — no matter the level of their technical understanding.