At the beginning of a term, your course may be hidden in order to prevent students from accessing it while you are preparing your course materials.
1) To check the visibility of your course, first click the "course management" icon that appears in the upper-right corner of your course's Moodle page:
2) On the list of options that appears next, click the "Edit Course Settings" link:
3) On the course settings menu, find the "Course Visibility" setting:
When this setting is set to "Hide," students will be unable to enter or view your course. Changing this setting to "Show" will make the course visible. At the beginning of the term, most courses will be left on the "Hide" setting by default. You'll want to make sure that this setting is changed to "Show" before the beginning of the term.