Bowline

 (REQUIRED) The bowline is among the most useful of knots because it forms a loop that will not slip and it is easy to untie. Use it to attach a cord to a pack frame, to tie a rope through a grommet on a tent, to secure a line to a canoe, in rescue situations, and in a thousand other ways. Learn to tie the bowline around a post and in the free end of a rope. With practice, you can even tie it with one hand.

Make a small overhand loop in the standing part of the rope. 
Bring the the rope end up through the loop... 
...around behind the standing part...
...and back down into the loop. 
Tighten the bowline by pulling the standing part away from the loop.
The bowline. 

Knots similar to the bowline: French Bowline, Bowline on a Bight, Man-Harness Knot, Alpine Butterfly, Figure Eight on a bight.

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