I've learned that you start off life killing small animals like rats and beatles, but the more you level up the bigger and meaner the things you have to kill will be.
I've also learned that doing repetitive tasks will earn you experience points to make you better at other non-related skills.
I've learned that if you want to do anything, you can't rely on the people around you (NPC's) to do it, because they are ******** and poorly programmed.
I've learned the camera-angle, and consequently your perception, is more often than not in a horrible perspective, so you end up going through life not seeing half of what you could.
I learned that to get good at anything, you have to do it repetitively for a long period of time, and the better you get, the slower you progress.
I've learned camping is something only noobs and poor people do.