Survival

Knowledge is one of the most important (and powerful) things known to man. Wisdom (applied knowledge) is doubly so. It will not only make you more effective at everything, but it helps you survive. Survival is it. That's what you should know before learning anything else. Take a class on it, or read books. Just get a basic knowledge of how to survive in different situations.

Why is survival so important? Because you can't do anything else unless you survive. You can't learn. You can't repent. You're done. It's over. That's why it doesn't matter what you must do, SURVIVE.

At all costs just make sure you're still breathing when the dust clears.