For undergards or new grads who only know basic physics (classical mech, E&amp;M, SR) this is a great book to get a feel of what string theory is. Even I, as a second year masters with some QFT experience, liked to read it before diving into a more advanced book just to learn the ideas without really wondering about the formalism. Of course you will not learn to do computations in string theory by reading this book but you will get familliar with the words and concepts really quickly. The first part covers classical strings and lightcone quantization of strings (only with Nambu-Gotto action) while introducing the ideas of QFT. Regular books spend a very short amount of time on that so it's nice to see it in more details. The second part covers more advanced material, like D-brane dynamics and dualities. It even introduces the AdS/CFT correspondnce. Overall I recommend this book to everyone interested in string theory, no matter the level. Beginners don't be scared and specialists maybe care to take a look.