I just finished working on my course and have published it, but when a student tries to access it, it's showing no content and a message that "the course is not built yet".
That's what I was doing wrong. Thanks!
This is likely because some / all of your content is set to draft still! You'll notice that your content is in draft mode if a small pencil icon shows up beside the chapter / lesson title:
In order to fix this, just go into the lessons that are still set to draft and make sure that the "Set to draft" option is unchecked and save your changes!