The learning process of this book follows very closely to the philosophy behind playgrounds. You will get the most out of this book if you play around with the code and ideas that we discuss. Instead of just passively reading through this, glancing at the code, put the code into a playground, and observe how it really works. Make changes to the code, try to break it, try to extend it, and you will learn far more. If you have a question, don't default to looking up the answer, try it out.
At its core, programming is a creative exercise. Yes, it requires the ability to think logically through a problem, but nine times out of ten there is no right way there is no correct answer. Technology is pushed by those of us who won't settle for the accepted solution, who aren't OK with following a fixed set of instructions, who want to push the boundaries. As we move forward in learning Swift, make this book and Swift work for you by not taking everything at face value.