Rent out a room on Airbnb. Living near a tourist area has its perks, including the prospect of renting out a room for a profit. With home sharing sites like Airbnb, you can rent out a room in your home – or even the entire place – for a day, a week, or longer. If you have extra space and might enjoy the company of travelers, renting out a room is great way to earn some extra money with little effort on your part. See our post, “How to Make Money as an AirBNB Host.”
Affiliate marketing is the best way for anyone to start earning money online. This requires zero investment & you can use your blog or even your social media platform like Twitter, Facebook to promote and earn money. Here is the best beginner guide to Affiliate marketing. I know of bloggers earning thousands sitting at home just with affiliate marketing. Here is a post where you can see how much a person like you and me is earning from affiliate marketing.
Multi-vendor marketplaces, like ThemeForest, can be very successful. Chose a niche and create a vendor website for it. Your marketplace could be anything, from a platform for local artists to sell their work on, to an online digital product store. Once set up, invite people in that industry to sell their products on your site. You take a percentage of their profits when items sell.
Just found a few cool websites that will pay you to either be an expert or give advice online.  Someone will literally pay you to give answer someone’s question or give them advice on a certain topic or subject.  It could be on relationships, their finances, you could offer tech support, losing weight, and many other things.  Everyone is an expert on something.  Maybe you have children and can offer advice on that, or perhaps you have a few dishes that you can prepare on a budget, or you know how to find bargains and can share your knowledge with others.  
Sell stuff online. If you have high-quality items to sell, there are a slew of online marketplaces you can use. Just make sure you understand the fees associated with your sale before you take the plunge. Where neighborhood Facebook pages and Craigslist ads are free, many online marketplaces or consignment shops charge for ads or require you to fork over a percentage when you make a sale.

If you’re willing to take on some risk and have the heart of a true hustler, you can make extra money online doing commission-only sales for startups and other businesses. While you won’t be getting a regular salary, with the right sales strategies and skills as an inside sales rep, you can make decent money for each sale you bring in. And because you’ll most likely be working with startups, if you can negotiate a little equity you could profit big time if you're pitching a solid product and the startup succeeds.

If you have experience with marketing, SEO, or a knack for getting people excited about the products and services you use on a regular basis, think about refining your skills and putting them to work making money online as a small business marketing consultant in your region—especially if you can become a local SEO expert and can help local clients rank higher in their search results.
How much will you make? I think my best month with Google AdSense was almost $5,000 over the last ten years. That amazing month blew my mind since it was actually near the beginning of my blogging journey. When you go from making zero to $5,000 in a month, that will rock your world. For me, it also got me even more excited because I knew there were other ways to monetize.
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