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.
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Every year, hundreds of millions of documents are notarized in the United States: wills, mortgages, citizenship forms, handgun applications. While for decades, this has all been done in person, there is a budding crop of sites that allow notaries to take their services online. If you’re already a notary, you can sell your services online. Or, if you want to get started, check out the National Notary’s checklist for becoming a certified notary.
By embracing a niche marketing strategy you can get your business to stand out above competitors who are taking a more general approach to marketing. Niche marketing involves targeting a specific demographic, where you might have several products or services that are beneficial for that particular group. However it can also involve providing a specific product or service, from which a broader market might benefit. In this case, you might consider your business to be niche more so than your market. For example:
Logan is a CPA with a Masters Degree in Taxation from the University of Southern California. He has been featured in publications such as Debt.com. He has nearly 10 years of public accounting experience, including 5 with professional services firm Ernst & Young where he consulted with multinational companies and high net worth individuals on their tax situations. He launched Money Done Right in 2017 to communicate modern ideas on earning, saving, and investing money.
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. 
While targeting a niche as your focus will make it infinitely easier to find them and convince them to buy from you, you need to be sure there are enough buyers in that niche to make it viable. A pet store that caters to a wide variety of pet owners has a much larger potential customer base than a pet store that caters to local ferret owners, or Poodle lovers. Those niches may be too small for a local population.
5. Evaluate. Now it's time to evaluate your proposed product or service against the five criteria in Step 4. Perhaps you'll find that the niche you had in mind requires more business travel than you're ready for. That means it doesn't fulfill one of the above criteria--it won't take you where you want to go. So scrap it, and move on to the next idea.
Whether you have a website or are still dreaming up ideas for a blog, you can also look into affiliate marketing. With affiliate marketing, you partner with brands and businesses within the content of your website. If you mention a product or service, you link to that produce or service using a unique affiliate code you received when you signed up for that particular affiliate program. From there, you’ll make money any time someone buys a product or service through your link.
When researching, if you find a fair number of similar products, but not an overabundance of products -- this means your idea could be profitable. Take a look at the price points of your competitors' products so you can price your own competitively. Resources like Amazon (for products), G2 Crowd (for software), agency directories (for services), and price monitoring tools like PRICEFY.IO are helpful in the process of evaluating your competitors' pricing, and determining prices for your own products and services.
20. Etsy – If you like to create arts and crafts, you can sell them on Etsy.It’s completely free to open an Etsy store. You simply sign up, post pictures of your creations and starting selling. You can choose your payment option, but PayPal is generally the easiest. Etsy makes it easy to sell and keep track of your inventory. There is a small listing fee and they take 3.5% of every sale you make.
These days, the trend is toward smaller niches. Targeting teenagers isn’t specific enough; targeting male, African American teenagers with family incomes of $40,000 and up is. Aiming at companies that sell software is too broad; aiming at Northern California-based companies that provide internet software sales and training and have sales of $15 million or more is a better goal.