Knot Magic
Knot magic has a long history, it has been used in many religions. In the Catholic church one would make a knot when he/she was praying to a saint for help, the knot was used to bind the saint to the person until he/she was helped. The Hindus associated the knots with the gods of death. Buddhists thought that loosening a knot was a sign of being freed. In many cultures knots would be loosened when a woman was giving birth, because knots would cause difficulties.
Knot magic can be used for many purposes, to protect, to seal a decision, to help others, to let something go, ...
The color of the rope and the number of knots depends on what you are planning to do. In my coven we once worked with a rope for better uhm well mature content here haha, I guess you can understand. We made nine knots and then when we would need it we would loosen the knots and let the magic work, it actually worked, but I didn't really need it
There is also a specific way to make the knots and a invocation for every knot (which I know in Dutch but sadly not in English).