You can make extra money left and right if you just know where to look. If you like to ‘tinker’ I’d suggest going to the DIY section on Pinterest. You can find thousands of projects there to make, and you can sell them at a nice profit. You can make 20, 30, or 50 bucks at a time, in real money. Not the ‘get rich online now!’ stuff you see around. I make old teapots into lamps, or old shirts into aprons and sell them locally on Kijiji or Craigslist. It’s totally doable.
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.
The biggest advice I can give is to pick a small niche, set up a site and start experimenting. Make mistakes and learn from them. That’s the only way you are going to succeed. Of course, have realistic expectations. It took me more than 1-2 years to start making decent money. But the beauty of it is that once you make that first dollar, you know it works and at that point it just becomes a matter of scaling it up, working harder and smarter to scale up your business.
Research other listings in your city on AirBnB and see what the going rate is for a place like yours. You could also just rent out a private room as well or even a bed in a shared room. In fact, that's how AirBnB got its start. However, you might find it hard in the beginning without reviews, but as long as you take really good care of your guests and provide a lot of value, the reviews will eventually come rolling in.
For example, let’s say you signed up to become an Amazon Associate so you can make money as an affiliate of Amazon. You then create a gardening video showing people how to plant a small tree. Find the exact shovel you are using in the video, on Amazon, get your affiliate link and put it in the description of your video so people who are interested can buy the same shovel on Amazon. For every person that buys the shovel, you earn a commission.