I learned to choose wisely what challenges to face and what challenges to just leave alone cause they will disappear sooner or later. I learned I should not quit, if a challenge becomes too hard. And I learned that time is the most important thing to consider when trying to overcome a challenge. Time heals wounds, time makes things harder sometimes, time changes people and time will, one day, overcome us all.
And another thing I learned from that particular challenge is that people normally don't change to the better. Because changing to the better is a very very hard thing to do, no matter what one is beeing told by the media or other people: changing to the better is a really hard and long process.