Schaum's Outline of Optics Book

Leonard Susskind is definitely the best alive physicist. I've recently learned about him that he was the man who treated Veneziano's dual model as quantum mechanical oscillating string.

This book is very hard to comprehend. All the topics are so abstract that you can merely imagine what is going on. Starting with simple Schwarzchild metric and doing manipulations in a way that you get conformally flat Minkowski space-time and then transform it to Rindler space is like whatever. Penrose diagrams are fatality.

On the other hands, authors get through different topics cohesively. I have no degree in physics, but I was able to follow majority of logic flow. The main aim of this book is explore black holes and show that they can be represented as a very very big 1 dimensional string

Black holes are extremely rare objects to observe in reality. However, they are just solutions to Einstein equations and physicist love to do so (solve those non-linear differential equations in arbitrary space-times in D dimension - whatever 2). If there exists a black hole then you can do some theoretical experiments. You can either stand far away from horizon or fall into a black hole.
That is the main observation in the book that discussions go around. Some fundamental laws should have to be modified that our current understanding of black holes be more realistic (and reasonable).

This book discusses 4 different views: Black Hole Complimentary, UV/IR connection, Holographic principle and String view of Black Holes. There are some mathematical formulas around to prove assumptions. At the end, you see that there exists a pattern: You have to find a connection between Bekenstein-Hawking entropy formula and statistical microscopic states or thermodynamic entropy.
Authors claim that calculations on all types of black holes that were studied precisely agree with Bekenstein-Hawking entropy formula.