One of the most useful knots to know for a marine scientist and generally anyone around boats. The name derives its name from its often use in attaching a line from the bow of ship to the leech, i.e. the outer vertical edge, of square-sail to prevent it from being blown inside out in the wind.
The bowline (pronounced “boh-lin”) forms a loop at the end of a line and is advantageous because it is easy tie and will not slip or loosen. I like to further secure the working end, the end actively used in tying the knot, when a measure of additional security is needed with a cable tie.
Below is the video showing how to tie the bowline, but I remember it by the rabbit in the hole technique. The working is the rabbit and the standing end is a tree trunk. The first loop, the rabbit hole, is made near the end of the rope. The rabbit comes up the hole, hops around the tree from right to left, and then back down the hole. Done!