People are turning to audio and visuals when it comes to technical subjects. However, you should consider doing an ebook first and turning it into an audiobook through a resource like Audible's ACX platform. You can hire a producer either through a royalty share program, so you don't have to shell out upfront cash, or you can do a pay-per-hour hire as well.
A site called User Testing will actually pay you a fee to evaluate websites. It typically pays you $10 for each video that you review – which typically takes about 20 minutes. If the work is there, and you are particularly good at it, you could earn up to $30 per hour. That’s a pretty solid pay rate for a work-at-home job. You wouldn’t have to work a whole lot of hours to generate a decent part-time monthly income.
Doing Fiverr gigs are a great way to build up a portfolio while still making money at the same time. Fiverr is mostly used for marketing purposes, which can be a great way to show off your graphical skills, or even write content. The website will take 20%, leaving you with $4 for the average gig, but doing a few a day adds up to substantial money by the end of the month.
If you own a car, you can make some spare cash as an Uber driver or delivery person. If you don’t own a car, you can still be a delivery person using your bicycle. Uber drivers looking to make even more money off their car can turn their car into an advertisement using Free Car Media. Your car will be wrapped with a removable vinyl decal. There have also been cases of Uber drivers selling products in their car. As a driver, you’ll often times start talking about what you and your passenger do for a living.
Some subjects are much better paid than others, so although you may love the idea of writing about travel (badly paid) a better bet would be a niche like finance (much higher rates of pay). Check out the Pro Blogger job board for high paid freelance writing jobs – other places to look might be Textbroker or you can look at the “gigs” section on Craigslist.
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.