Overhand knot

The overhand knot is a type of knot. It is one of the most fundamental knots and forms the basis of many others including the Simple noose, overhand loop, angler's loop, and fishermans knot and water knot. The overhand knot is very secure, to the point of jamming badly. It should be used if the knot is intended to be permanent. It is often used to prevent the end of a rope from unraveling.

Tying

There are a number of ways to tie the Overhand knot.

Thumb method - create a loop and push the working end through the loop with your thumb.
Overhand method - create a bight, by twisting the hand over at the wrist and sticking your hand in the hole, pinch the working end with your fingers and pull through the loop.

There are so many, many knots available to us all. There are three specific knots that I will talk about here.

This knot can tie two ropes or two ends of a rope together.

This knot is used to tie a non-slip loop on the end of a rope

I think the usage of this handcuff knot is self-explanatory

The name of the game is "Bondage and Discipline", not "Cuffs and Discipline". Bondage is an elemental part of B&D sessions. If you are insecure about your knot-tying abilities, your client will definitely notice it.

These three knots above should be considered 'bare minimum requirements' for anyone wishing to do sessions. For safety reasons, you should also be able to tie and untie them in the dark.

See also Curricula and/or Rope and Knot terms