Learn how to tie a Rolling Hitch - a useful knot for attaching a rope to a railing, post, or another rope where the pull is along the length of the fixed object. It isn't as good at resisting slipping as an Icicle Hitch, but it is a good deal quicker to tie. This is a good knot for sailing, boating, general outdoors and even bondage.
Have an iPhone? Check out all 200+ new features coming in iOS 13.