When you click on a chapter number, the first page you see is the objectives page. The objectives page lists what you will learn from the chapter. When you are finished working on a chapter you can come back to the objectives to see if you have covered everything in that chapter. Or if you need additional help on a specific topic, you can see if that topic is covered in a chapter from the objectives page.

You can browse to the Objectives of the chapter you want by clicking the corresponding link above.