Most trials are divided into Phase I, II or III studies. Phase I studies assess the safety of a treatment, while Phase II and III studies investigate the efficacy of a treatment. Because most drugs in Phase I trials haven’t been tested on humans yet, be sure to only sign up for Phase II and III trials if you’re concerned about suffering any adverse effects.
Offering to walk a group of dogs once or twice a day can really rake in some extra money. You could create signs and hang them up around libraries and churches, or perhaps take the modern approach and sign up with Rover. Rover is an increasingly popular marketplace that connects dog owners to dog walkers in their neighborhood. Check out Rover today.
This is one of the simplest strategies to employ -- just answer an ad for a business that's looking for part-time help. It might be for a job waiting tables or working a cash register, but no matter how unglamorous it might be, it will turn some of your time into money. Working just two four-hour shifts a week at, say, $12 per hour will get you nearly $100 per week -- and about $5,000 per year. You might do even better than that, such as if you wait tables at a fancy eatery and collect some hefty tips.
Now that you know how to make extra money, try a few of these (or all 30) and see if you can generate a nice little chunk of change. You can use these ideas no matter what Baby Step you’re on! Take that extra cash you bring in and toss it at your money goals—things like paying off debt, saving up for your emergency fund, or putting a little extra toward retirement. With extra dollars in your pocket you’ll be kicking major butt on your goals in no time!
If you're a crafty sort, you can make money on the side by selling your wares online or at farmers' markets, craft fairs, and other locations. Online, look into sites such as Etsy.com and perhaps eBay.com, where you can maintain a store and sell to a wide range of buyers, with the website taking a cut. There might even be some stores near you that will sell some of your offerings under their roof, also taking a cut. What should you make and sell? Well, the possibilities are myriad -- you might make sweaters, jigsaw puzzles, jewelry, soaps, candles, leather goods, paintings, ceramics, or all kinds of other items.
Great list! I have another to add – commercial litter removal. Provide a daily on-foot litter clean up service using inexpensive hand tools outside retail, office and industrial properties for property management companies. Almost as easy to do as going for a walk! Make $30 – $50/hour doing the work before you go to your day job. I started this side gig in 1981 and turned it into a lucrative full time business. Make money going for walks!
I know starting a blog is a way to make extra money.  I just wish it was not take so much time it is not easy. To come up with new things to write about plus getting the traffic to your site. Just like your list here no way you just set down and wrote this all at once it took a lot of research and searching your brain.  Great info and thanks for taking the time to put it all together.
Few of us love taxes or tax season, but if you don't mind filling out tax returns and you're good at it, you might make some extra moolah by preparing returns for others. Some companies, such as H&R Block, Jackson Hewitt Tax Services, and Liberty Tax Services, hire seasonal preparers and offer training for them as well. You'll do well to have an accounting degree, of course, but those without that background who take the time to get up to speed on basic tax return preparation may be able to prepare plenty of simple returns.
Amazon Mechanical Turk is a service that lets you make money online through doing paid microtasks. Each task is something simple that requires human interaction like rating search results, checking for the right spelling on search terms, categorizing the tone of an article, or even basic translating. You can do these tasks from anywhere you want and make money online from the world’s largest e-retailer.

As a driver with DoorDash, you get a notification when a delivery is ready in your area. It’s up to you to go pick it up or not. If you choose to pick up the food, the DoorDash app will provide you with specific instructions on where to go, how to get there, customer’s name, etc. DoorDash pays a minimum of $10/hour but say drivers earn $25/hour on average. Maybe this could be your new side hustle?

Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, a 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. 
 @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.
Ebooks can be a hard path to online success too, from my personal experience but as you rightly said, it can be a great gateway vehicle to drive traffic to other monetized sites. Having said that though, getting your ebook on Amazon, Barnes & Noble, Lulu, Smaswords etc., is a great way to get noticed and make money overtime. An arresting e-book cover is a MUST! And if you are a DIY freak like me, you could do your own e-book cover for $0. I also use a graphic design software similar to Philip’s.
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My next self-funded business hit $160,000 in revenue in its first year alone. After that first taste of self-made success, I’ve gone on to sign consulting contracts worth tens of thousands of dollars with startups like LinkedIn and Google, launch profitable online courses, and grow my blog to over 400,000 monthly readers and $50,000/mo in side income.
Hi, came across this information after trying to brain storm of fun way to make extra $$. I’m a RN and work 3 days a week and have 4 days off! (Best part of the job ?) I am thinking of trying to purchase Authenticate designer handbags and creating a page to resale. My delima is how to find a reputable supplier. Do you have any ideas?? I’ve even gone to Designer handbag selling sites and asked…all I get are members wanting to sell me “their” purchases at a small discounted price.

And ThunderCock… design isn’t just logo design. It’s brand development. Without it, there wouldn’t be major companies being recognized in their commercial standing in the world. IE. Nike, Microsoft, Apple, American Express, etc. Without brand identity, they would just be another company in the field with nothing noteworthy except the fine-print that the consumer will not read out-right . Brand identity combined with strategic marketing methods make for strong company understanding to the consumers. Without consumers, thees companies would be nothing.
If you have a nice camera and a good eye, snapping a few photos might be just the thing you need to figure out how to make extra money. You can go as all in with this as you want. Maybe you only shoot family sessions and birthday cake smashes on the weekends. Or maybe you decide to start a business as a wedding photographer! The choice really is up to you. 
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