Intelligence, is experience gained through applied knowledge. I’m not a fan of recommending books to be honest, What May havee worked for me, may not work for someone else, I also don’t believe I should be the shortcut to their findings either, I believe that if someone really wants to learn something, they should go learn it the best way they feel they would be able to apply the knowledge... And that might not necessarily be through reading a book. People tell me that they would love to read more, but maybe reading doesn’t suit your character? Don’t force a shoe that doesn’t fit. The awareness of your personality and how you best learn, should be the first step, Once you find out your best way of acquiring knowledge, do loads of it! Online courses, YouTube videos, Private mentor, audiobooks... Whatever way you can consume, retain and APPLY the knowledge learned, That is the way you should go