If you are the owner of a course you can create a task or goal inside of the playlists in that course.
Open the playlist dropdown and click on 'Create a task or goal'
Name the task or goal
Describe what should be done
Set a date it is due by
Set it as a task or goal (requires submission/upload
Set requirement - to include in progress tracking or be optional
Assign to people
(a goal requires a submission/uploading of content, a task has no submission and can just be marked as done)