Sheet Bend or Weaver's Knot.
This knot is used in bending the sheet to the clew of a sail and in tying two rope-ends together.
Make a bight with one rope A, B, then pass end C, of other rope up through and around the entire bight and bend it under its own standing part.
The Bowline.
A noose that neither jams nor slips. Used in lowering a person from a burning building, etc.
Form a small loop on the standing part leaving the end long enough for the size of the noose required. Pass the end up through the bight around the standing part and down through the bight again. To tighten, hold noose in position and pull standing part.
Halter, Slip, or Running Knot.