LOL (Let Over Lambda) is fun to read if you are not try to get the information in your head as fast as possible but rather read two or three pages a day very carefully and feel how your brain bends :) It is a hardcore technical book, but the language (Common Lisp) will not make you more money in 2020 or boost your new startup faster to market. So, read it to entertain your brain, it is worth it!
https://letoverlambda.com/