Activity completion
If you enable activity completion, you can define criteria or conditions when an activity is successfully completed.
Such conditions or criteria can be: the activity has been clicked, a grade has been reached, a date has been reached, or the person has self-marked the activity as completed.
Students will see to the right of the items when something needs to be done or what items have already been completed. Also in the course index, empty green circles symbolize that something is not yet finished and filled green circles symbolize that something has been completed.
Moodle on YouTube: Track Progress in Moodle