Find items that you know are selling below their full value (either online or through a deal website like SlickDeals.net), discount stores (Marshalls, Ross, etc.) buy them and sell them for more on eBay or Amazon. Once you find your product niche you can set up a system. Don't read over that too quickly. You need to find a particular product or niche to really make this work. Otherwise, you're met with different shipping costs, always trying to figure out new margins, etc. Don't try to be everything to everybody. Try to be good in one particular. Maybe it's a product you're passionate about such as selling trucker hats. 🙂 Click here for more on this idea.
Evaluate Web sites. Another way to make extra cash in a short amount time – $10 for about 20 minutes of work – is to sign on with UserTesting and evaluate Web sites. You need a computer with a microphone and Internet connection, and you’ll have to fill out a one-page demographic profile. You’ll receive work if your profile matches that of the target audience of sites being tested. Then it’s just a matter of using UserTesting’s screen recorder, which you'll need to download to your computer, to record your verbal comments and on-screen movements as you click through a site. Site owners typically are looking for feedback about whether the Web site is confusing to navigate.
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. 
Offering specific online SEO services is also another online freelancer role that businesses are crying out for. If you know how to improve a website’s SEO by doing keyword research, creating content that can rank in search engines, adding metadata / schema to posts and pages, and building backlinks to a domain, to name a few tasks, then this could be a great line of work for you.
I really like the idea of writing poorly written ads. It seem like it can be easy and you can make a small profit. I know that use to work at a school and we got our extra money from writing grants. People can write grants to start a business so I am in the process of trying to write my own grant to start a community program for teens. its a litte extra money and I still get to do what I love. If you have any kind of hobby you can prob. turn that into some income if you can get creative. Good luck
There are quite literally hundreds of clever ways to make money online. From taking online surveys, to renting or selling your old clothes, flipping your iPhone to someone in a different country, and even buying low-cost products locally, just to resell them for a higher price on Amazon. There’s truly no shortage of unique ways to make money online.
A lifestyle blogger writes about their everyday life, hobbies, and interests. From fashion, beauty tips, and male grooming, to food, restaurants, and travel, anything that you experience can be blogged about. And famous lifestyle bloggers can make big bucks. Once you have built up a following, there are many ways to make a profit. Add affiliate links to your website, promote sponsored services, create your own product range, and much more.
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.