Hi @AndrewHeath Happy to have you here! It depends upon your audience, your competition, and how much time you have available to promote one or multiple courses. You can take a look at some published courses about your topic and check how long their courses are to see if it's worth creating a long course or a short one.
2. What other instructors have done to gather this kind of feedback is offering the course to a targeted audience with a free coupon this way you will get feedback from the audience to make the necessary updates to the course.
3. Currently, this is not an option now since students need to take the complete course to get the certificate and all the content is available for them.
I hope this helps and maybe we can get some experienced instructors to jump in 😊.
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