Hello, young counter-part of 4+4 here. Thank you very much. I am looking forward to learning from all ya guys. As a teenager, what do ya think I need to prep for anything to happen?
But, you don't have to do it all at once
First of all, be physically fit. That will do more to keep you alive and well throughout your life than everything else. Don't partake of all the things you already know you shouldn't partake of.
Things you can start learning (I'm still learning, myself) include:
Communications - ham radio
Camping and associated skills, including land navigation (without a GPS), wilderness survival, shelter building, food preparation under austere conditions, finding and making drinkable water.
Home and auto repair.
Basic electrical and electronic repair, and computer progreamming.
Clothing repair (replacing buttons, sewing up minor rips, etc, as a minimum)
Cooking - it's easy to follow a recipe, but by following recipes you can learn a lot about cooking from scratch, with exuberance.
Animal husbandry - get a pet (fish don't really count)
Food production - grow something to eat
Learn a trade - even if you become a professional, a trade is a good thing to know (anyone want a spaceship designed? How about a network mangled? A house built?)
Learn a couple of languages (the earlier, the better) - Spanish or Mandarin would probably be valuable in the future. French or German? Not so much.
Learn how to learn, and love doing it. Learn something that has little practical use (Art history, music of the Italian Renaissance, pre-columbian textile arts).
Get a good education. What used to be called a 'Liberal Education', although these days it's pretty reactionary: English, Geography, History (World and American, but don't bother if the textbook is written by a guy named Zimm), Mathematics (through calculus), sciences including general chemistry (with lab), classical physics (with lab), biology (with lab). The so-called sciences that attempt to synthesize knowledge (ecology, earth sciences, climate sciences, etc are nonsense). Never take a class (or anyone in a class seriously) called X-studies (womans, chicano, black, earth, etc). Like sociology, undergraduate psychology and the like, it's not a real science and just a way to pay someone to indoctrinate you (we'll indoctrinate you for FREE!).
And don't rely on just school to educate you: Learn to ask questions of yourself, and how to find the answers, yourself. Don't take "I don't know" for an answer, take it as a challenge to find out. Why does a light go on when you flip a switch? Why does a cellphone work? What happens after I flush the toilet? How is carpeting made, a book printed, food moved from the field to the table (and whats in it).
Like I said, you don't have to do it all at once. Get back to us next week