Once signed into Ethos, you'll find the Courses tab on the left hand menu. This is where you can find any courses (a combination of Lessons and Quizzes) assigned to your account
Starting a course will bring up any lessons and quizzes associated with it
Course progress will give you a percentage of how much of the course you've completed. Lessons Completed and Quizzes Completed will show you the total number of each, and how many have been completed.
You can begin a Lesson or Quiz by selecting the Start button