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.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
Selling digital products can be just as successful as selling physical products. Graphics, software, eBooks, design elements, sound effects, songs and videos are just a few types of digital products that are in popular demand. So if you can turn your hand to creating digital products, let’s have a look at how you can make money online from this skill…
If you are not comfortable in penning down your thoughts through blogs and content writing, make use of your camera to create a video presentation. Create your YouTube channel, upload videos and start monetising them. Choose a category or subject that you want to make videos on and get started, but make sure it's a topic that will interest a lot of people. Everything from cooking shows to political debates can find many takers on YouTube. You have to create a YouTube channel, which works on a similar model as a blog. As you make your channel popular and the number of subscribers grows, so will your earning potential. The payment one gets is based on every thousand views.
As you start regularly putting out content, you’ll hopefully start to build a bit of an audience. But to start seeing real money from YouTube you need to market your videos elsewhere. Share your channel on Twitter and Facebook. Distribute videos anywhere else you can think of. Also, interact with comments and build a community around the videos you’re making so people will share it with their friends.
Rather than making money through subscriptions, YouTube channels are based on a traditional advertising system. Meaning the more viewers you get, the more you make. Once you’re approved for the YouTube Partner Program and can start including ads on your videos, with every 1,000 views, you will make approximately $2-$4. Which might not seem like a lot, but if you have 100 videos with 5,000 views a month each, that would be $1,000–$2,000 already. Just imagine if your videos start hitting millions of views!
Getting businesses to advertise on your podcast, either at the beginning or end, or both, is a great way to create a revenue through podcasts. Most businesses won’t be keen to advertise on your podcast until you can prove a large number of listeners. Therefore, it is unlikely you will be able to start out from the get-go with sponsors. But once you accumulate regular listeners, or a high number of downloads from iTunes, you can start to sell advertising space on your podcasts.
Keep in mind though, you don’t need a website to do sponsored content since you can also get paid if you have a lot of social media followers. My wife has a pretty big Instagram following, and she gets all kinds of sponsorships. Not only does she get paid in cash, but we get a lot of free stuff, too. We’ve received free rugs, free lights, and free carpet cleaners. She only promotes things she loves though, so this strategy works really well for her.