17. Amazon – Have you heard of FBA? It stands for “Fulfilled by Amazon” and it’s getting pretty popular. Basically, you buy products (in bulk is best) and ship them to Amazon for them to store. When your products sell, Amazon packs them up, ships them out and sends you the money (after taking their cut). There are people making a full-time living from FBA, while others just do it for some extra money.
Do you love taking pictures and have a general passion for photography? If so, you could make a very nice living for yourself online selling your photos. There are countless people who are willing to pay you good money for your collection of unique images you have to offer. Today more than ever it’s super easy to submit your pics to the masses, which can provide you with a very convenient approach to creating a solid source of additional income. Several stock photo sites like Shutterstock and Fotolia offer enticing incentives for individuals to earn money passively from the photos they randomly shoot in their spare time.
While it may be tempting to start blogs and sites that appeal to lots of top categories, this strategy may spread you out too thin and prevent you from ever truly optimizing any of these channels. Start with one niche that you are the most knowledgeable about, establish yourself as an expert and then expand out from there. Only then start working out other areas.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
Banner advertising, when set up using a system like I presently use, can be very hands off – in fact for me it’s entirely passive – assuming there is an audience that the sponsors benefit from advertising to. It’s difficult to make loads and loads of money just from banners unless you have significant traffic, but it is easy enough to make some money from it and once you do, it generally proves very reliable unless you stop updating your website.
Next, you’ll need the right tools. You can be as complicated or simple as you want depending on your comfort with audio equipment, but at the minimum you’ll want a microphone and software for recording your voice. Companies like Behringer, Blue, Focusrite, and others sell studio-quality plug-and-play podcast setups that can get you recording today.
But don't make the mistake of thinking this will be a passive source of income—you're on call whenever you have a guest and you'll always need to keep the place clean for incoming visitors. On top of just renting on Airbnb, consider offering your guests paid add-ons, like Lauren Gheysens', Royal Day Out in London, England—where she gives visitors a local's only tour of the city, complete with bespoke 18th century costumes.
Whether you have a website or are still dreaming up ideas for a blog, you can also look into affiliate marketing. With affiliate marketing, you partner with brands and businesses within the content of your website. If you mention a product or service, you link to that produce or service using a unique affiliate code you received when you signed up for that particular affiliate program. From there, you’ll make money any time someone buys a product or service through your link.