Last time you moved something in your car that was too large to fit in your trunk, you probably lamely cobbled together a few insecure knots. (Oh wait, that wasn't you - that was me.) The Trucker's hitch is a relatively simple knot you can tie with one rope that secures anything with the power of pulleys.
Watch the video above or walk through this step-by-step from DIY site Instructables. You've got a few different options for how you tie off the knot, but the basics are simple, and it's an indispensable knot worth adding to your DIY toolkit. While, you're at it, you may be interested in getting to know the versatile bowline knot.
Trucker's Hitch, THE most awesome knot on the planet! [Instructables via Reddit]