Hi @molily, firstly, huge thanks for your work, the book is fantastic! As I was re-reading [the article about components testing](https://testing-angular.com/testing-components/#testing-components), I noticed that a couple of topics (`Internal yet public` and `public for the template`) are a bit outdated. Angular 14 introduced [support of `protected` component members on template](https://github.com/angular/angular/releases/tag/14.0.0#:~:text=Support%20template%20binding%20to%20protected%20component%20members). Probably it would be a good idea to leave a note about this feature in the book.