Any Web application will run into the problem of storing sessions eventually. With CakePHP, you are given a great deal of flexibility on how you want to address the issue. Database sessions can easily be set up by changing a parameter and creating a table, which is a big time-saver.
You also learned about how the Request Handler is a multipurpose tool for changing the way your application is output. You saw how it can be used to handle Ajax requests and output RSS feeds. When you are playing around with CakePHP, try experimenting with other request types, such as detecting mobile devices.