Knot tying is a handy skill and easy to acquire. All you need is a short length of rope and watch a few videos. There may be thousands of knots you can learn, but most people should take the trouble to learn a few tried and true knots. Maybe you want to move a mattress on the roof of your car. Maybe you want to tie a pen to a clipboard. Maybe you want to tie back the legs when roasting a turkey. Maybe you need an impromptu collar & leash for a stray dog. Maybe you have to move a huge bundle of brush you've cut. Maybe you want to tie neat looking stopper knots on your hoodie's drawstring. Knowing how to tie a few different knots will give you options when you're trying to get stuff done.