The book "Science and Sanity" by Alfred Korzybski is probably the most important book I've ever read.
It can turn ordinary minds into "genius" minds. (I'm not a genius but I certainly was an impaired imbecile before I read it).
It's not a quick read. The first part of the book is mostly non mathematical and I've read it several times. The last part of the book explains relativity and I only read that once.
Here is the link. Check it out.