Amazon Mechanical Turk is a service that lets you make money online through doing paid microtasks. Each task is something simple that requires human interaction like rating search results, checking for the right spelling on search terms, categorizing the tone of an article, or even basic translating. You can do these tasks from anywhere you want and make money online from the world’s largest e-retailer.

Residual passive income involves assets that pay you monthly for little to no work, or from work you did once but no longer do. This income is key to automatically generating wealth over time. Some examples include collecting royalties from books you wrote, selling advertising on your blog or website, or selling digital products like e-books, online courses, online workshops or videos.
Salvage and resell. Do you love antiques or have a knack for finding valuables at flea markets or yard sales? If you do, it might be time to consider salvaging items for resale – or even scouting out antiques to sell for a profit. While you’ll need to spend quite a bit of time searching for prospects and spend some money buying upfront, you could easily turn a profit if you know what you’re doing.

A second topic I really like is the fallacy of the great idea. You do not need some great, original idea to be successful. Really all you need to do is take an existing idea and put a new spin on it. Do it better than anyone else. Combine two existing ideas that have not been combined so far. Take a look at Mcdonalds. They do not make the best hamburger in the world. They are not even close. But they do the whole process better than anyone else. The idea is not important, the proper execution of the idea is where the money lies.

People are always looking to have their cars washed and detailed. You could be a mobile car washer and detailer without having a permanent location. Reach out to people you know or make some flyers and put it in your neighbors' mailboxes. If you want to get serious about it, prop up a one-page website or give out business cards. You can make money quickly doing this.