The Learner Groups function on the Manage page allows you to organize learners in a variety of ways, such as by class, subject, course, year, cohort (or other ways you may choose). This makes it easier for you to assign course modules to a group (instead of individually to every learner), which is convenient if you have multiple courses. It also makes it easier to pull out reports for a specific group (for example, Project Management class, Spring of 2017). Also, if a course has multiple cohorts (batches) of learners over a year (and in the future, over many years), a Learner Group may be the most convenient way to create and view reports (rather than as course modules). As part of the process of creating a Learner Group, you will indicate which course modules are assigned to that Learner Group. Once you have created a Learner Group with the course modules indicated, you can then assign learners to that group.