For those who are skilled with social media, you can build up a following and then work with brands as an influencer to promote various products and services.
YouTube is also a popular platform for entrepreneurs. You can start your own channel and then earn revenue through advertising shares as you gain followers and views.
If you’re more inclined to create audio content, you can start your own podcast and then earn money through advertisers on your podcast or website.
Blogging is also a viable business opportunity for people of all ages. You can start your own blog about a subject you’re interested in and then earn money through ads, product sales, affiliate links or other methods.
For students that excel in certain subjects, you can offer assistance to other students that need help in that area by starting a business as an academic tutor.
Web Design Service
This is one business where you really should have some training and a lot of practice to get started. Yes, there are many people out there calling themselves web designers who just use templates and have only a basic html background, but you don’t want to be one of those.
The real money in this field is made by those who know what they’re doing. If it’s something that interests you, it won’t take that long to learn, and you can do very well from referrals and return business. And this is another business that can take you far beyond your high school years.