No area of interest is simply too compact On the subject of developing a course. There are actually courses on Udemy that have above 1,000 gross sales about market subject areas like baking sourdough bread, brewing beer and knitting. I also cleaned homes. For pre-teenagers and youths I suggest Pet https://make-money-online10839.blogdanica.com/37269901/little-known-facts-about-make-money-online