Hi, @BeatriceHoo505 Welcome to the Instructor's community! I see you are trying to clone an app to teach at Udemy, first I'll recommend you check if this can be done with our Trust & Safety team and explain the plans you have for this course and what information you will be using to build it, please email them at policy@udemy.com. Once you have confirmed this and have the green light, you can use the Marketplace insights, you can first search the topic of a course to see what demand vs supply is about this topic.
I hope this helps!
Eliana Cerna
Udemy Community Moderator
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