There are 3 ways for people to buy your course: 1) Direct marketing - Udemy drives a ton of traffic to their website, so people just naturally see your course(

There are 3 ways for people to buy your course: 1) Direct marketing - Udemy drives a ton of traffic to their website, so people just naturally see your course(s) and buy it. 2) Affiliate marketing - Udemy advertises your course(s) via things like Google Adwords. You make a very measly cut on these sales. 3) Personal marketing - You can promote your course through your own channels / reputation. You make like 98% of the sale when people purchase it this way. Without doing your own marketing, you can easily earn decent side income though.