What do you need to know? More than you can possibly learn. But a good prepper or sheepdog always strives to improve themselves, and that means constantly learning. Particularly learning how to survive after SHTF, or just in case of a local disaster. Always learn how to help others. A good scout is prepared. Prepared for what? Everything! Here is one more gem of herbal/medical understanding for you.
Even Kitty uses her thinking cap.