If you are struggling to find exactly the material you are looking for, try Open Culture’s listing of free online education courses. The page highlights 1000 lectures, videos and podcasts from universities around the world. The site features a lot of material found only on universities private sites, all in easy to browse categories. This means you can find hundreds of university courses, without having to visit and search each university’s own site.
For example, let’s say you signed up to become an Amazon Associate so you can make money as an affiliate of Amazon. You then create a gardening video showing people how to plant a small tree. Find the exact shovel you are using in the video, on Amazon, get your affiliate link and put it in the description of your video so people who are interested can buy the same shovel on Amazon. For every person that buys the shovel, you earn a commission.