The aim here is that you should end up knowing quite a lot about some important foundations of modern physics. But Schrödinger's Cormorant isn't going to make it easy: it will not simply present you with the facts but, instead, make you work a bit for them. It's all about active learning. There is a guiding text but most of the key results and techniques are developed through questions. The majority of these are mathematical in nature, giving you the chance to enjoy using the algebra and calculus you have learned, to derive, validate and explore the implications of some iconic bits of physics.
Some questions are short and simple but many require a series of steps. In these cases, you can work out your own route if you feel confident to do it but otherwise, there's step-by-step guidance. Each question also has a fully worked answer, which you can use to check your own answer or to help you on your way.
If you work through the whole thing, it forms a logical programme, so that you'll have worked on each of the various elements that contribute to constructing the Schrödinger equation before you finally put it together. But you don't necessarily have to do that. For example:
If you just want to learn about special relativity, you can just focus on Chapters 2 and 3 (plus, if you like, the appendix to Chapter 2).
If you are happy to take the momentum of a photon as a given, and want to get stuck into the quantum theory, you can start with Chapter 4 and work through from there.