If you have the gift of gab, public speaking is a worthwhile side business idea for you to pursue. Many authors, medical practitioners, scientists, artisans, politicians, and other subject matter experts earn extra income by delivering speeches, seminars, and presentations. Professional motivational speakers earn an average annual salary of around $90,000 with just that portion of their income, making this a very realistic side business idea while you continue practicing your craft.
As long as there is still the written word, there will always be editors. Freelance editing and proofreading not only pays a decent hourly wage, it also gives you the chance to read about potentially interesting topics too. What's more, pursuing freelance writing & editing as a business idea can afford you a lifestyle that lets you travel the world as a digital nomad. You can find lots of job postings from companies and individuals in need of writing, proofreading, and editing services on Upwork, which makes this a high-demand opportunity to make money online.

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.
There are few ways to make money while you shop. You can pick up short tasks that involve shopping, like doing price checks or photographing in stores or you can go mystery shopping. Mystery shopping is definitely a real way to make money but you have to be careful because the jobs can be the bait for scams, so you have to know the signs of mystery shopping scams. But there are legitimate companies that hire mystery shoppers. 
If you actually enjoy putting together Ikea furniture or standing in long lines, you may be cut out for doing tasks for others. Websites like TaskRabbit can connect you with people who need help with a variety of things. Moving, cleaning, delivery and being a handyman have the “highest earning potential,” according to the company. Read about how to get started on TaskRabbit.
Based in Freemont, California, and founded in 1983, Concentrix claims 90,000 employees worldwide. They work in a wide variety of industries, including health care, retail, transportation, e-commerce, insurance, technology, energy, and many others. Their specialties include marketing, analytics, technology, consulting, financial, and customer lifecycle management.
Test websites. Remote usability testing means getting paid to navigate a website for the first time and giving feedback to the website owner. Most tests take approximately 15 minutes, and you can get paid up to $10 for each test. A test involves performing a scenario on the client’s website and recording yourself doing it. For example, you might be asked to go through the process of selecting and purchasing an item on a retailer’s website.[1]
Still, knowing something about how the flower business works is a good idea, and your online presence and photos of your work will be critical to your success. Remember, the business is all about visuals, so make yours as compelling as you can. Get started networking by contacting local wedding planners and funeral homes and letting them know you’re in business. From there, let your business bloom. A friend in Maine turned a flower-arranging business into a successful flower shop she later sold at a profit.

Now, if you don’t know people who might want your coaching services, there are a number of online tools and communities that make it incredibly easy to find clients and teach, on just about any topic area you can think of. Community driven platforms like Savvy.is, Clarity.fm, and Coach.me provide you with a network of potential clients to interact with, as well an integrated payment solution.
Most companies that hire for search engine evaluation have multiple projects available to work on, so the exact work you do might vary. However, search engine evaluation in the traditional sense involves analyzing queries that regular people like you and me might type into Google or Bing search and then determining the best possible results to match up to that query so that users have the best experience possible using a search engine.
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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