By default your Canvas course is not visible to students. To make it visible, click the Publish button in the upper right corner of the Home page:
Publishing the course does not mean all the individual content will be visible. Modules and pages and files ... may be individually published or not by clicking on the slash or checkmark symbol. In this example, the module, Overview Week 3 page, and Learning Materials header are published and visible to students. But the "Mudslide Materials" page is not published, and thus not visible to students:
To test whether students can see content in a published course, switch to Student view, which is available across almost all areas of Canvas. Just look for the "Student View" button in the top right and give it a try!