In Lesson 2 you were introduced to the 12 Bar Blues chord progression. Another very important chord progression to learn is called the turnaround. Like 12 Bar Blues, it is the basis of many songs. and it will probably sound familiar to you also. See song list in Lesson 29.
Also practice this turnaround chord progression using different chord inversions. Turnaround progressions are discussed in more detail in Lesson 29.