Are you a professional in a field that can help answer questions for people looking for your expertise? Websites like JustAnswer and LivePerson match you up with people looking for answers to technical or professional questions. You can make money online by simply answering these questions and providing the right information to people based on their individualistic circumstances.
If you hook up with a for-hire car parking service (the type hired out for fancy neighborhood parties) you can make some nice cash tips in just a few hours at night and on the weekend, when parties are held. The key here is to do a great job by showing hustle and being super friendly. This was one of the most enjoyable jobs I had during graduate school. Who doesn’t like to drive nice cars?

You can potentially make even more money by offering to handle snow removal in the winter. Shoveling snow is often a homeowner’s least favorite job, and there are many homeowners who simply cannot handle their own shoveling because of physical limitations. Typically, snow removal companies charge a flat fee for the winter, no matter how many times it snows. You can offer to remove snow a la carte, or you can copy the standard procedure and charge a flat rate. If you already own a snowblower (or can invest in one), this can help you speed up the snow removal process and allow you to take care of multiple neighbors each time it snows. (A snowblower will also save your back muscles!)
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. 
If you have an extra room in your house, consider listing it on Airbnb. Airbnb is a new way to travel for many people around the world. Instead of booking through expensive hotels, why not stay at someone’s house? As a guest, you can choose high end to low end, choose to stay with other people or opt for privacy. As a host, it’s a great way to make side money, utilize unused space, and meet new people! How much you can earn depends on your area so I recommend finding out by becoming an Airbnb host yourself If you click this link and make a purchase, we earn a commission at no additional cost to you. !
…Marketing an eBook is definitely the hardest part. Ebooks have exploded in popularity and the market is unfortunately saturated with crap from people who thought they could write a quick eBook, put it on an affiliate network, and make millions. However, if you CAN find a good way to market (or possibly have others market by having it listed on affiliate networks) then an eBook can be a great way to make some residual income.
You could try advertising more, for example, by putting up signs around the neighborhood, posting about it on social media, or having people you know spread the word. You could also try doing it in a different neighborhood that might have friendlier people, or do it in a time and place where there's likely to be a lot of people walking around the area (e.g., near a church before the end of a mass).
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