Learn to tie nautical knots! If you have an interest in sailing then this will be something fun to learn. What are the different knots and what are they used for?
The Bowline makes a reasonably secure loop in the end of a piece of rope. It has many uses, e.g., to fasten a mooring line to a ring or a post. Under load, it does not slip or bind. With no load it can be untied easily. Two bowlines can be linked together to join two ropes. Its principal shortcoming is that it cannot be tied, or untied, when there is a load on the standing end. It should therefore be avoided when, for example, a mooring line may have to be released under load.
The Anchor Hitch, or Bend is also known as the Fisherman's Hitch, or Bend. It is an excellent knot to use for attaching an anchor line to an anchor. Logically, as a knot to attach rope to an object, it should always be called a hitch. However, the name Bend derives from a time when when it covered "tied to" and was not restricted to joining two ropes.
You can find many knots and animated how-tos at Animated Knots by Grog.