What does published mean in the course line?
When a course is first created it is in what we call an "Unpublished" state. This means that only teachers can access the course and any content in it. To make the course available to students the instructor needs to Publish the course. Only at that time will students be able to access it. So the header you are referring to is letting the instructor know if the course is published or not.
Here is a quick guide about how to Publish a course How do I publish a course?
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