According to me the best way to earn money is freelancing in case you want to work for someone else. If you don't want to work for others, focus on what you love doing and try to make money out of it. In case you are good at writing, use it to write articles or stories and you can actually either upload them on your websites (articles only) or if you are good at story writing the sell them at http://www.webuystories.com/, it is a good place to sell your stories.
In case you are good at singing or dancing or cooking or anything else which can be captured in a video, then you must probably make a youtube video. If you are good at trading, you should probably focus on that.

In case you think you aren't good at anything you must probably focus on learning some new skill for a few months and then once you feel you have mastered it you should probably try to monetize it. To make your skills popular you have lots of social media like facebook, Instagram, youtube, etc. I would prefer Instagram since most of the youths use it.

Thank You