Completing paid surveys is one of the most popular ways to earn extra cash online. There are entire websites devoted to nothing but surveys that you can register with and be paired with surveys that best fit your profile. You will get paid according to the terms listed at the beginning of the survey and will have the chance to add some extra money to your wallet. When taking surveys, it is important to be honest and take them seriously because you can be banned from the site the researchers determined you did not put any effort into your answers.
Career in online marketing – This one comes per the suggestion of Ian in the comments, and rather than rewrite what he said, I’ll simply quote him: “There are two types of careers. The first one, where you have to work out of an office, is not really making money purely online because it’s a job that requires an office presence (although an absolutely amazing one and one that may still make your list). However, another route is starting your own SEM agency. If you start your own agency, you can make a tremendous amount of money from the comfort of your own home if you work hard and are really good.”
Anyone interested in making money online should be pursuing passive income, while also working on active income. There are loads of ways to generate an income passively on the internet, many of which start at the foundation of having a blog, generating substantial traffic and building an audience and a list. Is it easy? Nope. Is it worth it? It sure is. But that doesn't mean you need to start a blog to make money online today.
Now next, you’ll want to pick a WordPress theme from somewhere like ThemeForest, Elegant Themes or OptimizePress. This is the barebones design of your site, which you can then customize with your own branding, copy, and images. That being said, you don’t want to cheap out. It costs less than $100 to buy a theme that will make your website look professional (and you can upgrade to a completely custom design once you get the business going).
The money is most certainly in the list. If you're at all interested in online marketing, setup email software and create a lead magnet that you can use in your sales funnel. Then, build up that list. It's often said that you can expect to earn about $1 per subscriber per month. If you have a list of 10,000 subscribers, that means you can earn roughly around $10,000 per month. You will need to deliver value and not pitch them on every email, but it is a very achievable goal in a short period.
UPDATE – I can no longer recommend ANY multi-level marketing program to make money online. I have yet to encounter one that didn’t take advantage of people. MLM is almost always a scam, even if the products are legitimate. Stay away from MLM. Below is a video I made about MLM networks. Below that is my original text, which I now denounce, but I’m leaving it up simply for transparency. MLM is a scam.
If you have nothing of value to sell from home then retail arbitrage might be a better option for you. Many people partake in arbitrage to earn a little extra money, and for some, it has even become their full-time job. Retail arbitrage is the buying of goods at a low price and then selling them on a different platform at a higher price. Sales in shops provide ideal opportunities to pick up products for next to nothing. These can then be sold on eBay or Amazon for higher amounts, making you a nice profit.
Some of the best things in life are free and market researchers love to hand out new products in exchange for consumer feedback. If you like to try new products and have the opportunity to try them out for free, do some research and find the market research companies that offer products you desire to try. You can join campaigns and they will send the products or coupons to you to test them and provide feedback. You will generally have to fill out surveys and provide written reports based on your opinions. You will get to keep the products and they will sometimes even send you a monetary gift as an offer of thanks for doing the work.