Turning slips into strengths: How do you learn from mistakes?

I once messed up a big presentation, which felt like the end of the world. But looking back, that slip-up was the best teacher I ever had. It forced me to refine my core habits and stop rushing. I love finding the silver lining in these little disasters. Does anyone have a story where a mistake actually led to a better way of doing things? I'd love to hear your experiences!