Great list! I have another to consider that I personally have 35+ years experience providing. Clean up litter outside commercial properties on foot using inexpensive hand tools. It’s almost as easy to do as going for a walk! I started doing this as a side gig in 1981 and soon grew it into a profitable full-time business. I share my experience in my book, Cleanlots.
If you're crafty, join Etsy and set up your own shop. Sell your crocheted scarves, patterns or even blog templates you've designed. Etsy is full of a variety of products for sale. Just take a look for inspiration. However, because Etsy is full of other sellers, you'll have to work extra hard to make your store stand out from the crowd but Etsy has plenty of tools to help you monitor your traffic, put your products on sale and find new ways to increase your revenue.
Get samples. When you first start out as a freelance writer, it can be hard to get work without any published samples. However, it is possible to get quality samples if you are willing to do some writing for free. First, you can publish content on your own blog or website. Also, you can write guest posts for someone else’s blog. Finally, you can write blog posts for free in exchange for a byline.
A spin-off for web designers is to offer a landing page creation service. Well-optimized landing pages can be the difference between a successful and a failing business. And, as creating the perfect landing page isn’t easy, this is a service many businesses are prepared to pay for. I know people who are earning 6 figures per year and all they do is create landing pages for businesses. There’s serious money to be made.
Etsy is the most popular online marketplace for handmade goods and crafts. From bracelets to phone cases, rings, furniture, and more, Etsy is perfect for anyone who is creative and wants to sell their handmade creations. As long as you have the space, this can make for one of the best ways to make money online that can be started with a very limited investment. Consider these 5 steps to starting an Etsy store, from Handmadeology.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
Our first overlooked opportunity is selling your knowledge. In this instance, we are talking about creating a course or eBook that you can make available for purchasing online. Because of the automation available today, you may be able to put in the work once when creating your packaged information and then enjoy those checks coming in for months or years to come.
Double check yourself, before you double wreck yourself. Make sure everything you send to a company, whether a résumé, an email or a portfolio, is good to go. Double check your grammar and wording, and for God’s sake use spell check! This is especially important when it comes to the company’s name. Don’t spell their name wrong and be sure to type it how they type it (e.g. Problogger, not Pro Blogger).
Ibotta is an app that pays you back for things you buy at the grocery store. The reason I'm listing it here is because when you cash out, the money goes instantly (or almost instantly) to Paypal. I've never had to wait longer than five minutes to get my money from Ibotta! You can also earn from referrals there, too. However, you must have at least $20 in your account to cash out. Still, cashing out every week isn't unrealistic with consistent use.
As an Instacart personal grocery shopper, you will actually be doing the grocery shopping yourself (so don’t crush anyone’s avocados!). Your compensation depends on several factors, like the average size of your orders and average number of miles driven per trip. You can also get tips in addition to the pay that comes directly from Instacart (most people report an average earnings rate of $15 per hour).
Robo-advisors are diversified investment accounts that are automatically managed by a computer algorithm (as opposed to a human money manager). If you want to invest, but don’t have the money, or don’t want to invest with a money manager, robo-advisors are for you! Robo-advisors make investing easier—and cheaper—so they’re perfect for new investors.