1. These are definitely the 2 most common, but anywhere you can use an affiliate link, you can make money. I see a lot of people spamming Quora with affiliate links but wouldn’t advise it. People who will actually buy the product through your link are the ones you will educate on why they should buy it. You need your own platform somewhere and blogs/YouTube and usually best.
It’s becoming increasingly important for businesses to have a presence on social media. If you have a knack for using social media platforms such as Facebook and Instagram, you could make a living helping businesses reach out, engage and promote their product through social media marketing. Social media managers or specialists also can earn money through training and consulting.
Mechanical Turk is Amazon's take on micro-jobs. These are small miniscule-jobs that you can do for other people, which they call HITs, or Human Intelligence Tasks. These are super simple tasks that anyone can do. Some examples are listing off some URLs with certain kinds of images for one cent, or recording a few phrases with a microphone for 6 cents.
If you're serious about making money online, start a blog. Blogging is one of the easiest and most sustainable income sources. As long as the blog is setup the right way, in the right niche, with the right content targeted at the right audience, and the offer is complementary to the content, you could make a tremendous amount of passive income from a blog.
Website Development Help – need help setting up your theme? I’ve been working with the same 2 developers for 3+ years. To hire them, sign up for a Freelancer account, post your job (WordPress theme installation) then invite user i333 or bdkamol to your project. If you want, contact me and I will introduce you to them via email. Both are great developers with reasonable rates, speak fluent English, and I outsource all my programming work to them.
Tim after reading your comments I had to reply about the online fitness coach. I know nothing about having a online personal coach or what it entails but I do know about having a trainer. I love my trainer he has me doing things that I never would have thought I would be doing however that being said it is expensive. If this an option for someone that whats to get in shape why not. But like i said I have do not have any personal experience with it so I don’t know whats involved.
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.
These add review stars to snippets and increase click-through rates. I have tested many rich snippet plugins over the years and my favorite (and what I use now) is the WP Review Pro Plugin by MyThemeShop (view the demo). It’s fast, looks great (here’s a page I use it on), comes with 16 pre-styled designs, supports user reviews, and is well-supported by the developers at MyThemeShop. I was previously using WP Rich Snippets but the developer abandoned the plugin and hasn’t updated it for 2 years, and All In One Schema lacks customization options.
Cafe Press: This website allows you to create digital designs that can then be sold on the platform. You'll earn a commission for everything that sells and you'll never have to deal with logistics like printing, warehousing and customer service. If you have some graphic design skills, then this is a great potential source for your web-based income. 
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