If you are good at Mobile app development, or perhaps you are an experienced welder, you can create educational videos and articles, and even teach a whole class by signing up to websites that offer such services. Making an online course is no easy task, however quality content and a little effort can make your course several hundred dollars worth, so it might be a good idea to consider.
The second big takeaway for me, was to pick a niche you know, you find interesting AND where there is demand for your product – ie willingness to buy/pay. A lot of people only remember the first part of this 2-part formula, and end up creating a blog on knitwear for kittens. But it’s the overlap of passion and profit that Ferriss stressed so much.