The fisherman’s knot is a fantastic yet simple way to tie 2 pieces of cord or rope together. It’s secure yet easy to undo again afterwards. Here’s a short guide on how to tie it.
Tie a simple thumb knot in one piece of cord.
Slip the second piece of cord through the thumb knot.
Tie a thumb knot in the second piece of cord, around the first piece.
Pull both thumb knots tight and bring them next to each other.