I did freelancing and some of my friends did some SEO and quite good amount of money with Adsense etc when they were teenagers.
But if you don't really need much money (I didn't when I was teenager, but of course this was only me), I would rather use the time to learn and explore new things and have fun. Of course if you can combine earning money and learning new things, its great.
But if you don't really need much money (I didn't when I was teenager, but of course this was only me), I would rather use the time to learn and explore new things and have fun. Of course if you can combine earning money and learning new things, its great.