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.
Consider thinking about other ways of making money on YouTube. Maddi Bragg is YouTube-famous for her beauty and “outfit of the week” videos. Lucas and Marcus Dobre are 17-year-old twins who make challenge videos. You also might have heard of Charli's Crafty Kitchen, which features an 8-year-old who makes $127,000 per month with her cooking and baking videos!
Finally, when looking around for the right personal finance software that meets your needs, make sure that you’re comfortable with the program’s interface. It shouldn’t be expected that you recognize every single feature instantly, but if the features don’t seem readable and manageable to you, then you’re not as likely to use it and get the full benefits.
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.
Has anyone ever told you you have a voice for radio? Are you great at creating original characters with just your voice? There are tons of people looking to pay for quality voice overs for their corporate videos, animation series, or educational videos. Check out Fiverr and UpWork or create a profile on a specialized site like Voices.com or The Voice Realm to get started making money online doing voice overs.
I have not personally done this but I would like to eventually. If you are artistic you could make artwork or handmade good such as ornaments, wallets, or jewlery and sell them online. Something that I personally would like to do is design T-shirts and sell them. Shop for anything from creative people everywhere is a great site and I have bought many things from them. If you make quality products and get your name out through Facebook or other social media you could get a substantial business going.