Those who love teaching but would prefer to make passive income could consider teaching online courses. With online courses, you can teach topics that go beyond what a tutoring gig for students would teach. If you’re great at building stable relationships, you might create a relationships course. If you’re an ecommerce expert, you might teach a course about dropshipping. There’s no limit to what you can teach. You can also niche down within an industry to teach courses about specific subtopics. For example, instead of teaching public relations you might teach a course about growing your blog traffic.
High-ticket consulting or coaching: You could sell your own high-ticket consulting or coaching products from your website. You'll still need a website, merchant account, sales funnel, lead magnet and many other items. But you can easily earn a substantial amount of money from each individual customer, making it well worth the arduous setup required. 
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.

Work in grocery delivery. Instacart is a company that will pay you to pick up grocery store orders in your spare time. The entire purchase and order takes place through the Instacart app, making it easy for you to pick up the groceries your customers wants and get paid. Like other food delivery jobs on this list, Instacart lets you earn a per-trip rate plus tips. Shipt is another service that will pay you to shop for groceries and deliver them to consumers in your area, so make sure to see if they’re available where you live.

If you regularly buy domain names but fail to use them, you can always try to sell them for a profit. Selling domains is ultra competitive though. If you own a one word .com domain you’ll have a better chance of selling. Words that have high search volume sell well too. Also, domains that are on trend at that moment have a better chance of selling. For example, a year ago fidget spinner domains were an easier sell than they are now. You can sell your domains on Go Daddy’s Domain Auction. Look through the domains with the highest bids to see what type of domains sell well. It’ll help you know whether or not the domains you have are worth selling and how much money you can make selling them.

Whether you have a website or are still dreaming up ideas for a blog, you can also look into affiliate marketing. With affiliate marketing, you partner with brands and businesses within the content of your website. If you mention a product or service, you link to that produce or service using a unique affiliate code you received when you signed up for that particular affiliate program. From there, you’ll make money any time someone buys a product or service through your link.
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