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 cloud symbol. In this example, the module and 2 pages are published, while a third page is not published:


To test whether students can see content in a published course, switch to Student view (Settings | Student view) and give it a try!