Yes, encapsulation is a very important concept to read about, I forgot to mention it in my message.
Yes, the book is written based on neuroscientific knowledge that facilitates learning, and it works incredibly well. Before I read this book, I had been trying to understand Design Patterns for weeks or months through discussions on forums with good developers, web tutorials... But I couldn't understand anything, I saw no point in coding DPs. Then I received this book, read 2 or 3 chapters the first evening, it was very exciting to read, I dreamed all night of boxes connecting together (classes/objects), and the next morning I understood everything! ??