Dear Udemy provides all the information inside the instructor account, Click on "Tools" tab and there you can search any topic and get the analytics data as well keyword search volume and best seller courses all at one place. Every topic have at least 5 bestseller instructor. So you cant judge any topic to become bestseller. But you can surely rank on the topics where number of courses are " average" means low in numbers you can scale very fast. For example your "canva" choice is very good for digital marketing aspirants on Udemy. But differentiate yourself from the others. You can create your course in such a way that students get knowledge about the subject - canva and its complete usage and how can they earn by using this skills, Because every business looks for creatives to use on their websites or emails or any other purpose. your students can start their creative journey by creating good designs on canva and make their website to be used for their clients and client can edit those designs on canva again as per their requirement or use it directly. Hope it helps.
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