Like talking to people and helping walk them through problems? You can bring in extra income as a contract customer support superstar for companies all over the world. Due to the 24/7 nature of online businesses, companies are looking for people in different time zones to help deal with issues that their users are having. Better yet, if you have experience in service or retail you’ll be perfectly suited. Check out indeed or the other remote job boards I listed earlier to find opportunities.
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.
While some might think that starting a blog is an arduous effort, when you understand the precise steps you need to take, it becomes far easier. It all starts in the decision of choosing a profitable niche and picking the right domain name. From there, you need to build your offers. You can easily sell things like mini-email courses, trainings and ebooks.
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. 

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.

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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. 
Cashcrate is my favorite site and the one that I’ve received the most checks from. I’ve been doing it for about a year now and honestly have never had a problem with it.You earn money by doing free offers, surveys, watching ads, shopping online, participating in live contests and referring your friends and family members to the site.Cashcrate is one of the most popular GPT sites having 990,000+ members.I have made close to $3000 using this great Get Paid To Site. The amazing part is I’ve spent only about 6 hours a week on this site and I’ve earned $300 in 1 month! I can’t urge you enough to try it out for yourself.

You can sell your ebooks through Amazon's Kindle program or Apple's iTunes Connect, which gives you access to a large majority of the digital-book reading market and the barriers for entry are incredibly low. You don't need to invest lots of money to make this happen, but you do need to invest lots of time, not only in writing the ebooks, but in marketing them as well.

So many people dream of writing a book, but never go through with it. Yet no matter what, I’m sure you have experience and value you could give through writing a book. By packaging your skills and knowledge into a downloadable eBook that helps people learn a skill, advance their careers, or start a businesses, you can change someone’s life and even make good money online. You'll just need to employ an easy tool like Sellfy in order to quickly sell PDF files (like an eBook) to your readers.
Jumping into the field is relatively simple. Most prospective transcriptionists start by taking an online transcription course that teaches them the skills necessary to perform common job duties. Companies, such as Transcribe Anywhere, offer classes that teach students the basics of general, medical, or legal transcription, and just as importantly, how they can go about finding clients for work.
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.