When conditions turn harsh you need to make sure that you've secured your gear, your tent, and your camp tarp properly. Knots are just like tools, there are different knots for different jobs. Learn knots that suit common outdoor situations. Learn some "party trick" knots. Learn how to set up a tarp properly!
Start with a ball of twine and turn it into a rope. Learn how to whip the ends to keep it from fraying. Learn how to splice the end of a rope, to splice two ropes together, or to splice a loop at the end of a rope.
What interests you?