The Overhand Bend is used to join straps, webbing and ropes. A little bulkier but easier to untie is the Flemish Knot, a variation which is also shown in the video. Tested breaking strength: 56%.
The Carrick Bend is used to join heavy ropes. The ends are tied to their standing parts to prevent the Carrick Bend from pulling too tight, allowing it to be easily undone.
Beautiful and secure is the Zeppelin Bend, an ideal knot to join ropes of similar diameter. It was originally used to join the mooring lines of big airships. Tested breaking strength: 47% of the breaking strength of the rope it is made with.
The bowline on the Bight is used to make a doubled eye in a rope without using the ends; however it can also be tied to a ring or other closed object using one end of the rope. Tested breaking strength: 51%. Also shown: The Portuguese Bowline.
Use the Marlinspike Hitch for a strong pull on thin lines or whipping twines. It is quickly laid around a Marlinspike or any other suitable object, only holds under tension and is easily untied again.
Mastering this knot allows you to make fast with great tension to lash or secure an object or improvise a makeshift pulley to exert force without any implements. Shown is a method with a 3:1 and another with a 6:1 advantage.