Each class session has an interactive lesson that you will work through after doing the readings and watching a lecture (if applicable). These lessons are a central part of the class—they will teach you how to use R and other packages eventually leading to the tidyverse family.
Interactive training sections are provided on Data Camp.
Here is some advice. Carve out some time everyday to go through these. If you try to complete everything in one sitting, it will probably be overwhelming! However if you have familiarity with some modules, please feel free to work ahead.