It often happens that courses are assigned repeatedly to learners. For example, workers in manufacturing are asked to regularly update themselves on safety rules to be allowed access to dangerous facilities. Also, many large companies implement monthly job satisfaction questionnaires for employees.
If you don't like the idea of enrolling users in such courses manually each time, use the re-enrollment feature, a course assignment repeated at specific intervals.
In iSpring Learn, you can set up automatic course re-enrollments or reassign them manually.