I took Quantum Mechanics in the 90s without really understanding why the professor was making us learn specific formulae or why all the advanced math I had learned actually applied, or even what was actually happening.  Back then we didnt even go over entaglement. Somehow, I have continued to be interested in the topic, and maybe felt it was one course that got the better of me. I have watched Dr. Susskind's lectures with interest online, and thought I would try this book.  I was absolutely amazed at how systematically, clearly and carefully Dr. Susskind introduces the path and the math that will lead the reader to understanding the fundamental principles of Quantum Mechanics. I am not sure if anyone that didnt take physics or math at an undergraduate level would really understand this book. Even though I had taken advanced math and modern physics that goes into all of the relevant topics leading to quantum mechanics, nothing really prepared me for the actual course. This book should have been  required reading in the first few weeks of my Quantum Mechanics class before we even opened the first chapter of the designated book.