Webinars are quite possibly one of the most potent ways you can make an exorbitant amount of money online. You'll need an audience to train and you'll need to know what you're talking about. Of course, this usually requires having a website and some semblance of an online presence. However, people can still do webinars without all of that. For example, you might have a sizable social media following and you train them every week on something to do with social media. But you will need a product to embed and sell at some point. Don't worry about it in the beginning. In my experience, the best webinar platform out there is GoToWebinar. 
Double check yourself, before you double wreck yourself. Make sure everything you send to a company, whether a résumé, an email or a portfolio, is good to go. Double check your grammar and wording, and for God’s sake use spell check! This is especially important when it comes to the company’s name. Don’t spell their name wrong and be sure to type it how they type it (e.g. Problogger, not Pro Blogger).
However, like anything else truly worthwhile, apps require a significant investment of your time or money upfront. If you don't have the skills, then you have to hire someone who can assist you in creating a great app. But first you need to come up with an idea that will sell. Do the proper market research and analytics to come up with the right app.

Fiverr is one of the biggest providers in the gig economy on the web and you can sell a wide variety of services and products through this medium. Do the research and find out what you can offer. However, keep in mind that like any other money-making task, it takes time to succeed here. And stellar reviews will help you generate more and more income over time.

Dayo, sadly, because of the market size, app related business remain only profitable in a few western countries. I don’t know of any that could be used in Nigeria. That said, you can always put your own twist on things and make something that people in your local area could find useful. Essentially, you create a niche market out of it, and that can be very profitable.

Instead, go with a self-hosted site (like my blog here is)—this means your blog will be hosted on your own server and you'll have full control over it. There are tons of highly reputable, affordable companies you can choose a web hosting plan with to get your website online, like Bluehost, Kinsta, A2 Hosting, Dreamhost or one of these monthly web hosting services.

However, like anything else truly worthwhile, apps require a significant investment of your time or money upfront. If you don't have the skills, then you have to hire someone who can assist you in creating a great app. But first you need to come up with an idea that will sell. Do the proper market research and analytics to come up with the right app.
_{Job well done, Satrap. The first thing I look for in a site like this are signs that the author is being paid to hype the companies. It’s very tough to find good information that isn’t stricken with bias. There were a couple of times during the article where I actually got excited thinking, ‘Hey, I could do that. I’d actually LOVE to do that.” That being said, I can’t help noticing that you refer to all of it as “extra” or “supplemental”income. Are you saying that with all of these options, sticking to one’s regular “day job” is required? In your experience, if someone really commits to doing this, is it possible to earn a decent living? Cubicles suck.}

It doesn’t pay much, but if you’re a healthy person and want to make a bit of extra money online, the AchieveMint app will reward you for doing things like walking, tracking your food, or taking health surveys. AchieveMint works by connecting to fitness apps you might already be using like Fitbit, RunKeeper, Healthkit, and MyFitnessPal and then giving you points for certain actions. For every 10,000 points, you earn $10 with no limit on your earnings.

Thank you so much for this great article, it was very helpful, you definitely have a lot of information here. I own a business, so I work quite a bit, but I really need something else to help me sustain, especially though the winter months because it’s mainly a seasonal business. I’m curious, when you first started, how did you find something that worked for you? I know it will take a lot of hard work, and that’s fine with me, but I get discouraged signing up for a lot of these sites and only making 10 cents on the 4 or 5 surveys or videos, or whatever they have to offer, then there’s nothing left. I’ll spend an hour getting signed up for these sites, then it only nets a dollar or something and it will say I have to wait for new work. And I know it takes time to build up, but what can I do or where can I go to see some real traction online? I’m working on building an O Desk profile too.
Next, you’ll need the right tools. You can be as complicated or simple as you want depending on your comfort with audio equipment, but at the minimum you’ll want a microphone and software for recording your voice. Companies like Behringer, Blue, Focusrite, and others sell studio-quality plug-and-play podcast setups that can get you recording today.
^{27. Sponsored/paid posts – Many blogs publish sponsored and paid posts. Sponsored posts are basically just posts about a specific brand, product or service. A company will pay you to publish an article about it. It’s similar with other paid posts as well. Your basically selling the spot for the article on your site. If you decide to take this route, you’ll want to build your traffic before you will get many offers.}