If you’re currently an accountant, this might be as simple as letting your clients know that you work remotely now for reasons of convenience or perhaps hanging your own shingle out to start your own firm. On the other hand, if you’re looking to enter the industry (virtually or not), you should be aware of the training and certifications necessary.
Create a flier outlining your services. Before you do that, you need to know what those services will be. Do you want to simply do bookkeeping for a small business? A more involved level of accounting would be to work up balance sheets, income statements, and other financial reports on a monthly, quarterly, and/or annual basis, depending on the needs of the business. Other specializations can include tax accounting, a huge area of potential work. 
Not too keen on shuttling people around? We totally get it. How about dropping off a to-go order of burgers and fries instead? Driving for Uber Eats, Grubhub or Postmates is a great way to make extra money in your free time just by delivering food to hungry clients. Bonus points: Your car is going to smell amazing. We’re already kind of jealous of you, really.
If you are more confident in your skills, you can also market directly to websites and blogs. You can contact the sites by email to market your services. That will also enable you to select the specific types of sites that you are more comfortable working with. Since there are literally thousands of websites and blogs on the web, the potential market is limitless.
Samples. You’ll need some samples before you can really begin marketing yourself. Figure out which market you want to approach first, and then find or create some related samples. For instance, if you want to try your hand at blogging, study some successful blogs, and then write a few posts of your own to use as samples. Do this for any and every market you’d want to write for.

Boats that are hauled out of the water for the winter or even just for mid-season repairs will need the hull cleaned. And depending on the type of boat, it is a good time to give a major cleaning everything else too--the decks, the sleeping quarters, the head, and the holds. Start by approaching homes that have a boat sitting in the yard. Or you could market your services to the marina to contract you to do the boat cleaning it offers to customers.
There's also (of course) now an app for this side business idea. It's called Bellhops, and you can quickly sign up to start working as a mover almost right away (after going through their application process). The best part about using Bellhops is that they already have customers booked and ready to schedule their moves, meaning you can pretty much get a steady stream of moving jobs depending upon your location, just by signing up and setting the hours that you're available.
Market your talents to building contractors. People purchasing new homes can often be overwhelmed with the choices and possibilities in home decorating. Design some questionnaires for each major element and each major room in the house. Find out how the homeowner will use the home--are there children? Pets? Does the woman of the house wear high heels? Do the home's residents neglect to remove shoes? How will each room be used? Where might task lighting and ambient lighting be most appropriate?
If you have a way with words and know how to make the keyword-friendly, beautifully designed, SEO-optimized landing pages, why not charge other companies for your services and turn it into a money-making side business idea? Even a short landing page is worth a couple hundred bucks in most cases, and so much more if you know how to pitch your prospects well. If you want to get started with your business idea of becoming a landing page specialist or freelance copywriter, check out Len Smith and Sean Kaye's awesome course on Udemy, Copywriting Secrets: How to Write Copy That Sells.
I overheard my wife talking to a homeschool mom that raises and sells a certain type of dog (a registered breed of some kind) ranging from $1,000 to $1,800. I also know a couple teens that started a bread business where they sell the product at the local famer’s market and local stores. The product(s) have been so successful, most of the family has been involved in it.
But if you get the green light to do it, starting a catering service is a relatively low-overhead way to create a new business. It’s a lot of work, but if you enjoy cooking, it could turn into a lucrative and fulfilling career. To get started with minimal investment, you could first cook in your customers’ homes and use their dishes. Also, a narrow specialization on a particular type of cuisine or event may help you attract clientele as you work develop a strong customer base.
Consider your expertise. If you take the time to reflect on your experiences, you will realize that you have more knowledge about which to write than you might think. Begin by listing three assets that define you, such as your profession, a special hobby or a personality trait. Next, list three things that inspire you, such as religion, education or charity. Finally, list three of your dreams, such as getting married, traveling or spending more time with your children. These three lists should give you many ideas of topics about which you can write.[13]

Now, it’s time to start creating and uploading content. Make sure you’re using a high-enough quality camera (most smartphones will work but I’d suggest at least having a tripod so your footage isn’t shaky), but don’t worry about being perfect at first. The beauty of YouTube is that you can continue to test out different content and styles as you find what works for you. Instead, stick to a regular schedule to build up your subscriber base.
Pet sitting usually involves going to someone else’s house to take care of furry loved ones. Pet sitting could even involve living in someone’s house while the client is away. You have to think about the types of services you’ll provide and the types of animals you’ll take care of, but generally pet sitting is a low-cost, high-pleasure business idea.
Creating a jobs board website can be another profitable venture. The ‘jobs’ field can be quite saturated, so it is important to find a niche that is still crying out for a jobs board website. Monetize this type of site by charging businesses to list their jobs on your site. Those searching for jobs could also be charged a fee to access the higher paying job adverts.
Dogs are amazing. But, owners aren’t always at home to take them for a walk. If you’re a canine fan like I hope you are, this great side business idea can net you a regular profit by just taking some adorable pups for a stroll around the park. With pet-crazed, yet busy Americans having more pooches around, dog walking services have become a thriving industry in some U.S. cities. In fact, there’s already an app called Wag that links up dog walkers who want to exercise this business idea with the pet owners who need a helping hand.
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.

This is similar in concept to micro-tasks, except that it is oriented toward specific services, such as cleaning services, pest inspection, handyman services, house cleaning, lawn & garden services or any of the skilled trades. It might actually be more accurate to say that it is a platform where skilled service providers can offer their services to site visitors, similar to Angie’s List.
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 
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