We covered quite a bit of information in this chapter! We learned how to integrate our application with a MySQL database, started storing user information securely in our database, and expanded upon our knowledge of console commands. We also covered how to add behaviors and how to add relations to our models. Additionally, we went over including Composer and Composer dependencies into our project to reduce the amount of code that have to import manually.

In the next chapter, we'll be expanding on the knowledge we learned and the tools we developed to build even more complex and integrated web applications. Before continuing on, be sure to take a look at all the classes we referenced in the chapter in the official Yii documentation located at http://www.yiiframework.com/doc/.