If you have a propensity for writing and you can slay with your prose, consider writing an ebook. While the market has certainly become saturated as of late, books that help teach people about a technical topic still sell extremely well. This is a great source of passive income but does require a large amount of effort at the outset before any money is generated.
Ebay is a bellwether. It's been around since nearly the start of the online boom. But, like any other platform, success can seem fleeting if you don't know what you're doing. Selling items on eBay, professionally that is, can be an art form. Getting people interested in your auctions isn't always easy, especially when there's hefty competition and low demand for what you're selling.
Etsy: While Etsy's popularity has declined recently, it's still a great resource for selling handmade items online. No need for complex ecommerce sites or merchant accounts or any sort of automation. The company takes a commission of every sale and charges a small listing fee per item. But many still use Etsy as their primary source of income. The best part is that you can also sell digital products on here such as poster designs. 
Daily Surveys can be taken one or more times per day. This is indicated in the survey description. Other targeted surveys can be taken as you see them. Be sure to complete these when you see them. Some surveys may accept a limited number of responses from people matching your demographics, and can sometimes disappear quickly. New surveys come out all the time too!
Writing an eBook and selling it on your blog can be a great money maker. Your eBook should be directly relevant to your blog’s content so you can sell your book to your existing audience. Creating a recipe eBook for a food blog or an eBook full of training plans to complement your fitness site are just a couple of examples that have the potential to sell.
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.
There are numerous printing companies that will print your designs onto not just T-shirts, but also hoodies, hats, posters, cushions, bags, and phone cases, to name a few items. These businesses also offer fulfillment services. This means that you promote the merchandise on your own site and once you sell a product the printing company will not only print your design but also send the item directly to the buyer. So all you have to do is concentrate on the marketing and selling of your products, and the fulfillment company will take care of the rest.
VAs are skilled, home-based professionals that offer companies, businesses, and entrepreneurs administrative support. Some of the major areas of work includes making phone calls, email correspondence, Internet research, data entry, scheduling appointments, editing, writing, bookkeeping, marketing, blog management, proofreading, project management, graphic design, tech support, customer service, event planning, and social media management.
You can work as a virtual assistant through dedicated websites, such as Upwork or Zirtual. All kinds of skills are needed, and compensation can vary anywhere between $10 per hour to $100 or more. Obviously, the higher pay will be to people who have more technical skills, such as web building skills and marketing. But you can find work doing administrative tasks at the lower end of the pay scale.

You could also opt to use existing websites for making money. These include both active income and passive income methods. For example, you could sell some used items or invest in creating some digital designs that then can be sold on merchandise. Again, devote a sizable portion of your time to passive income so that you can slowly build up earnings that will arrive on autopilot without any extra added effort. 
While Etsy is fantastic for handmade goods that you’ve already created, if you’ve got killer designs that would look good on phone cases, t-shirts, or even wall hangings, pillows, and duvets, you can sell them on Society6 without paying anything to start. Society6 lets artists upload their designs and create their own shops where they choose what products their designs can be used on. That means one design can be used to make a whole range of awesome products that are printed and shipped on demand whenever someone buys from you. With top creators making thousands every month just from selling their designs.
Matched Betting (not available in the USA) enables you to gamble (nearly) risk-free. I say nearly as there is always room for error! It involves placing bets on all outcomes of an event, using free online bets given out by the Bookies. Although it may take a while to get your head around the concept, Matched Betting can make a substantial addition to your monthly income.

Here’s a good example of how lead sales can work in real life: My second website, Life Insurance by Jeff, brings in a ton of traffic from people who are searching the web to find answers to life insurance questions. While I used to have the website set up so I could sell these people life insurance myself, it was a lot of work to process all the different requests and clients. As a result, I started selling the leads I gathered instead.
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