Let us examine the advantages of marking lessons as completed
The reason why you should mark a lesson as "completed" is to track your learning progress. It helps you to manage your time better and also provides feedback to the course creator.
Sometimes, it is necessary not just to track the progress, but to also make the next lesson available. In this case, the course creator requires you to move through the lessons in a sequential manner.
The completion of a lesson is indicated by a checkmark icon next to the lesson's title in the sidebar.
Where is the "complete" button?
The "Complete Lesson" button is always located in the bottom bar, which is fixed to the bottom edge of the browser window.
If it is not visible, you should check other lecture tabs and go to the last one where the button will be displayed.
Obstacles to Completing the Lesson
It may be confusing if you are unable to complete a lesson. As previously stated, one reason may be that the completion button is located on the last lecture tab. Another possibility is that you have unfinished quizzes. In this scenario, attempting to mark the lesson as completed will result in a notification informing you of the need to pass the quizzes, along with a list of links to them.
