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.
You can do the same thing with strollers, kids toys, etc.  One EXCELLENT item to flip is iPhones!  There are SOOO many scammers on Craigslist from other cities who list $200 new iPhones.  They are fake ads that want people to call them and then the “seller” will scam the buyer.  Anyway, enough scammers list $200 iPhones that the legitimate people in your city selling iPhones see the low prices on Craigslist and think that’s the going rate!  I  bought an iPhone last week here in Boise for over $200 less than the LOWEST used price on Amazon or eBay.  I could flip that phone for a nice profit, and there were several other iPhones in Boise priced similarly that I could do it with.
I started out earning a side income with photography.  All I did was build up a portfolio taking pictures of models (usually good-looking friends and family members who modeled for me) and then I started a cheap website on Squarespace to list my photography services.  The phone didn’t ring often, but I got a few gigs each year ranging from $100 to $2,000 to shoot weddings, engagement photos, senior pictures, corporate events, etc.

​Affiliate marketing is the practice of partnering with a company (becoming their affiliate) to receive a commission on a product. This method of generating income works the best for those with blogs and websites. Even then, it takes a long time to build up before it becomes passive. If you want to get started with affiliate marketing check out this great list of affiliate marketing programs.

There are hundreds, if not thousands, of websites offering users the ability to get paid for taking surveys online. Same as with Cashback sites, if you encounter a survey site where sign up if not free, simply avoid it. I have not checked it myself, but a few online entrepreneurs suggest trying toluna.com. Also, you might want to try Cash Crate - In addition to getting paid for taking surveys, they offer cachbacks and other quick online income perks.
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.
My esteemed marketing colleagues initially balked at the idea of creating products that generate royalties, so I can understand how creating something from nothing might be daunting for those who aren’t even in creative roles. However, realize there is this enormous world out there of photographers, bloggers, artists, and podcasters who are making a passive income thanks to the Internet.
Some writers favor Infobarrel over the bigger Hubpages because Infobarrel’s earnings program lets you keep a majority of the money that your articles earn. Currently, as a publisher, you are entitled to 75% of the revenue generated from the display ads on your articles. In the past these ads were paid out from Adsense and other advertisers but because not everyone can get a Google Adsense account, Infobarrel now pay directly to writers. All you need now is a PayPal account which can be an advantage if you are just starting out. Also, InfoBarrel forums have a regular thread entitled 'InfoBarrel Earnings Reports’. You might want to check it out if you’re wondering how much money other writers on this site make. The last time I checked, the numbers were fairly low.
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. 

This has become a popular business model for online entrepreneurs over the past several years, and will probably just continue to grow in popularity. The best thing about selling online courses is that once you do the up-front work in creating the course and setting up your marketing strategy, you can get paid over and over again for work you do once.
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