This chapter covers a lot of ground, including Sass, and Bootstrap's responsive grid and several of its components. However, this chapter is not comprehensive coverage of all you need to know about either of these things. The reasoning for this is simple—not only are there books devoted to Bootstrap, but Bootstraps's website is the ideal place for where to look up documentation on Bootstrap. Duplicating their documentation would not have been a good use of this book's pages, nor would it have been a good use of your time and hard-earned money. Instead, the smarter thing to do is to introduce Bootstrap's grid and components in a practical way—such as by building an application together in this book—and to just refer you to the official documentation as needed.

By the way, the same thing applies to Chapter 5, Flex-Layout – Angular's Responsive Layout Engine, Chapter 8, Working with NG Bootstrap, and Chapter 9, Working with Angular Material, because each of these technologies has their own official documentation. 

My job is to do the following:

• Introduce these technologies to you (and point you to their official documentation)
• Demonstrate how they can be applied in a practical, interesting, and, hopefully, engaging way
• Encourage you to work through the entire book, so you can be well on your way to becoming an Angular web development guru 

By the way, Angular, of course, also has its own official documentation, but there's so much to it that it can be intimidating to even get started. In my experience, a far more interesting way to learn a new technology is by following a tutorial—and that is exactly what this book is—a comprehensive tutorial for building an application, with the added explanations and some bonus material sprinkled in throughout the chapters in the appropriate sections. If I did my job well, you should be able to build almost any application you are likely to need (or want) to build with Angular. That's the goal.

Let's now take a look at Listing Carousel, which is the example application we'll be building together.