You can create your blog using a free platform from WordPress.org, but you’ll need to pay a small amount – as little as $4 per month – to have your blog hosted. Try GoDaddy.com, which can provide a domain name for your site, email addresses, database storage and other Web hosting services. To make money, you can use the free Google AdSense service to display advertisements on your site. The amount you’re paid varies by ad and usually depends on how many people see it. There's also what's called affiliate marketing, in which you earn a commission (usually less than 10%) whenever someone clicks on an ad on your site and purchases a product. The Amazon Associates affiliate program allows you to advertise the retailer’s products on your site, or try affiliate networks such as CJ Affiliate or ShareASale that work with thousands of companies. Depending on how much time you put into your blog and how many people visit it, you could be making a few hundred dollars each month within a year.
Have a spare bedroom — or two? Making it available on vacation rental sites can provide a lucrative side income. For example, Airbnb hosts earn an average of $924 per month, according to data from Earnest, an online lender. If you’re a renter, just make sure that everything is kosher with your rental agreement beforehand. Learn how to cash in on short-term rentals.

These ways of making extra money cover a wide range in terms of compensation and prestige. Check out the options to see what could work for you, keeping tabs on a projected per-hour rate so you can see what would be worth your time. The list is loosely arranged by 1. jobs requiring more skill or expertise, 2. gigs needing less and 3. things you can sell. And if you think of any good options I missed, please let me know in the comments.
 @Philip Taylor I was merely using medical science as an example profession. It’s quite obvious that you don’t have any professional courtesy and downplay professions in which you don’t understand. Logo design isn’t just logo design. I don’t know what the profession of a public accountant entails, or a lawyer perhaps, so I’m not going to give advice on matters that I don’t especially have knowledge in.
Just a few years ago, I never thought I would be staff writing, and I never even thought about it. But once I began, I really started to enjoy it. I really love to write (yes, I do realize that I’m not the best and I probably should proofread more, but I do like to talk), and writing for different blogs was fun for me. How are people supposed to know that you are looking for a freelance writing position?
With Google AdSense, you can earn passive online income from your website by showing ads that are relevant to your visitors. The great thing about Adsense is that Google does most of the hard work i.e., they find the advertisers, pick the ads, track the clicks, and even deposit the earnings straight to your bank account each and every month. No wonder that 65% of the top 200 websites that show ads use AdSense.
Creating and selling courses on your blog can be a successful way to make money online. The course itself should be relevant to your blog, and based on a topic that will benefit your audience. Although it may take time to create the course in the first instance, once completed, you can then repeatedly make money from the course each time you sell it.
Writing eBooks is an excellent strategy for people who are skilled writers and feel like they could do enough research to learn what is necessary to write a book on some topic.  I wrote my first eBook about photography.  I wasn’t a pro, but I really liked photography and thought I could at least share what I’d learned so far.  It did so well that it is what motivated me to start a blog and work online.
The prep work before you open up shop is more time-consuming. You need merchandise to sell, photos and descriptions to post, a name for your shop and a business plan to help you succeed. Once that’s done, you’ll still need to find customers. Depending on what you’re selling, that could take weeks, which is why you should expect the overall time for this gig to be slow.
Get paid for your opinions. Taking surveys online can be a relatively quick way to earn enough to afford a few extras. Harris Poll Online, for example, awards points for the completion of online surveys, which can take between five and 25 minutes to fill out. Survey takers accumulate points and can redeem them for gift cards from retailers such as Amazon and Starbucks. Other online outfits that will pay you to take surveys include SurveyClub, Global Test Market and Swagbucks. There's no cost to sign up.

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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