What is the most important thing you've learned on your own?
In three sentences, explain something that you've learned without being told by another person -- something you've figured out all by yourself. Here's an example:
"I learned how to paint with water colors by reading a book and searching for YouTube videos. It took me a while, but I figured out some techniques that really work for me. I'm not an expert yet, but I have discovered a real joy in painting."
It can be anything -- a practical skill (like painting) or a knowledge set (like how to use mathematics).