We think of Lessons in two ways for the Study.com project.
Study.com pages are organized into Lessons. A lesson is exactly what might expect: a webpage that explains a specific topic, or main idea.
Once we check the file and grab the Lesson web address (URL), then we visit that page to start the task (see image below).
A Lesson is a record to be processed. The lesson is the single item we are working on. In this understanding of the Lesson, we are seeking to complete it by selecting the Primary and Secondary keywords for that Lesson. The files we receive from the client contain many Lessons that we work on (see image below).