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.
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 
There are several ways to make money from your car such as taxiing people, renting your car, or advertising businesses. Run the numbers before using your car to make money, especially if you're driving more than usual because it might cost more than you earn to use your car as a money-maker. Factor in depreciation, wear and tear, and gas expenses when you decide if driving is a cost-effective way to make extra money. 
25. Products – You can create your own product, such as an ebook or computer software. You would then use your blog as a promotion tool to get people to buy your product. As long as you create a legitimate product with a whole lot of value, you should be able to get some buyers, but like everything else with a blog, you’ll need the traffic to get the sells.
 @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.
This can include advertising, but many businesses also need help just filling up their social media profiles with relevant (and consistent) content. If you enjoy learning about social media and want to take things a step further and make extra money, social media management is a great option. If you’re good at it, it can also open up a lot of doors for you down the road. This is a great article from Small Biz Trends on How to Start Your Own Social Media Business.

 If you’ve got some free time and don’t live in the middle of nowhere, becoming a Lyft driver can be a very lucrative side hustle that allows you make money fast. And right now, they’ve got a promotion going on where any new driver will instantly get a $300 bonus after completing their 100th ride. If you start now and hustle hard on the weekends, you can probably unlock that bonus within a few weeks of driving (and that’s in addition to your normal earnings).
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