if i understand the question correctly, then my answer is: none.
i believe chess is largely "self-referential", meaning that your skills at the chess board do not help you in real life. you bring your skills and innate abilities from "outside the game" and apply them on the chess game and not the other way around. i said "largely" because, as with many things, there are exceptions. i think teaching the young chess will help them exercise and flex their mind's ability. (just like certain video games have been proven to improve eye-hand coordination and reaction time)
You are always in the situation at hand. No matter how you got there. You can only make the best, practical, decision at this point in time
Great point.
Even in a perfect-information game, you can't consider all the consequences to your actions--you can only make the best decision you're able to, and since that's the best you can do, don't have regrets when that wasn't good enough. Nothing else you could have done would have been good enough either.
Be happy with your skill level in whatever you do--if you compare yourself to the best, you'll always come up short. You don't have to be the best. Take pride in how good you are.
Mistakes happen. Embrace them and learn from them; don't fear them.