You can sell your ebooks through Amazon's Kindle program or Apple's iTunes Connect, which gives you access to a large majority of the digital-book reading market and the barriers for entry are incredibly low. You don't need to invest lots of money to make this happen, but you do need to invest lots of time, not only in writing the ebooks, but in marketing them as well.
Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs. 
Profit from you photos. If you’re skilled with a camera, you can turn your photos into cash by selling them to stock image sites, such as Shutterstock.com. If the photos you submit are accepted, they can be downloaded by Shutterstock’s subscribers and you can earn anywhere from 25 cents to $120 per image download. Other sites that accept photos from contributors include iStock, Dreamstime and Sqeeqee.
Whether you want to become your own boss, start a side hustle, or earn extra money on the side, any of the strategies listed above can help. By finding ways to increase your income, you can free up more cash to pay down debt, save for the future, or invest for retirement. Saving money is only half of the equation. And if you truly want to get ahead, you might want to figure out how to make money – and hopefully, lots of it.
Medium is an online community where anyone can post articles and essays and get them in front of their audience of millions of monthly readers. While it can be a great place to build your audience for your own blog or find customers for your consulting business, with Medium’s new Partner Program, you can now make money online whenever someone reads your articles. Register for free and you can choose whether your articles are freely available or only readable by those people paying $5/month for a premium Medium membership. You’ll make money based on the amount of people who read and engage with your posts each month.
Make sure you have some sort of money maker on your website before you start promoting it. You could promote an affiliate product related to your site's topic, or you could use Google Adsense. Your goal is to get your site to make the most money possible, so if you have lots of ways to make money on your site, then you will most likely make lots of money.
As I mentioned in a previous post on the 3 Types of Affiliate Marketing Explained, the way I earn money with affiliate links in ALL of my online businesses is by promoting only products that I have used, and only what I would recommend to my friends who want to achieve similar results. I feel that anyone with an audience has a responsibility to do the same thing.

Tutor students. If you have an academic specialty and can squeeze in a couple of hours during the week while Junior is taking a nap or Janie is at gymnastics, share your knowledge with struggling students. Find students looking to improve their grades on your own through your kids' schools – check a site such as Craigslist.org to gauge hourly rates in your area – or sign on with an online tutoring company, such as Tutor.com. You must be available to tutor at least five hours a week and have a college degree to tutor certain subjects for Tutor.com. Tutoring is done virtually from home via a computer, not in person. Tutor.com tutors are paid an hourly rate based on the subject.

More and more companies and startups especially are embracing remote work—where you use online collaboration and communication tools to do your work from wherever you want. And you don’t have to be a 20-something hotshot designer or coder to reap the benefits of working remotely. Many remote positions are for customer support positions or other customer-facing positions that don’t require specialized skill sets.
Using a food delivery service can’t necessarily earn you money, but it can help you save you money if you constantly find yourself throwing out half the food you buy. Food delivery services send a box of food every week with new, sometimes unique vegetables, meat, fruit, and so on. If you don’t have time to shop and want simple meal-prep that leads to a good meal, a food subscription service may be perfect for you.
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