Reporting will help you know whether users are going through your course overall, and who specifically has completed (or needs to complete) the course.
You can even see which articles in the course Learners left off at.
View overall course progress
This gives you a quick overall view of how your course is doing.
View overall article progress
You can see which articles users are dropping off at.
View individual user progress
See which users have yet to start the course, and which part of the course users dropped off at.