2. Which book would you recommend about blockchain/ cryto ecosystem?
I just loved this collection of books
http://sociumtrade.com/blog/materials-for-self-improvement/the-best-books-about-blockchainIve also started to read The Complete TurtleTrader: How 23 Novice Investors Became Overnight Millionaires by Michael Covel. But thats more for trading tips.
As for my 4. Favourite Books?
Im going with Harry Hole books by Jo Nesbø

and recent discover of Discovery of Witches ))
Enjoy the read!