1. Make Udemy courses (and sell elsewhere also). There are lots of topics which still don't have good courses on Udemy, even though they claim to have tens of t

1. Make Udemy courses (and sell elsewhere also). There are lots of topics which still don't have good courses on Udemy, even though they claim to have tens of thousands of courses. Example: http://www.businessinsider.com/rob-percival-online-coding-courses-2015-2 http://www.businessinsider.com/rob-percival-online-coding-co... 2. Other forms of content - like eBooks. If you can write about a technical topic or a business topic, there is money in it. example: http://nathanbarry.com/samuel-hulick-37000-self-published-book/ http://nathanbarry.com/samuel-hulick-37000-self-published-bo... 3. Mobile apps - don't know much about it. This seems to be a hit or miss thing 4. Affiliate sites using various affiliate programs like Amazon, eBay etc. 5. Teach in person - this is awesome if you can pull it off. I've seen people do a weekend course and make 5k or more depending on the topic. These are some interesting resources that I've recently started following: http://www.sidehustlenation.com/side-hustle-show/ http://www.sidehustlenation.com/side-hustle-show/ http://www.smartpassiveincome.com/category/podcast/ http://www.smartpassiveincome.com/category/podcast/ But the best is probably to build a SaaS application. Hard part is finding a need :( Here is a beautiful example https://blog.pinboard.in/2014/07/pinboard_turns_five/ https://blog.pinboard.in/2014/07/pinboard_turns_five/ ($200K per year with bookmarking site).