A very useful feature which is part of the special settings is the Preview Lesson. By activating this feature, the lesson will become available for everyone so that they can see what the course is like.
A course is a collection of lessons and quizzes, a good idea is to have your first lesson set up as the preview so that your users get a general idea about the course. This is useful only if the course is a paid one.
The rest of the features are self explanatory.
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