Unless you publish your course, it will not be visible to your learners. Also to make any changes that you made, to your course content, available to your learners you need to publish the course.
To publish your course, go to your course, click on the publish button from your course builder page, as shown in the image below
In the next page, review your course feature and settings and click on Publish This Course
And your course will be published in no time