We've covered a lot of ground this hour. If it hasn't all sunk in, don't worry. We'll be reinforcing the basics throughout the rest of the book. Some of the more advanced concepts to which you were introduced while learning about symbols will be reintroduced later.
The highlight of this hour was learning to use the various object creation tools. You've created shapes, such as rectangles, circles, spirals, grids, and the list goes on. You've created advanced designs using symbols. And to top that off, you've started using some of Illustrator's palettes, including Swatches and Styles. Quite a list of accomplishments for a single hour!