My dad taught me how to make a crown knot when I was in cub scouts. I'll be 65 in a few weeks so that will give you some sort of indication as to how long I have been doing this. My dad was a boatswain mate in the navy in WW2 and told me they used this knot to put on the hand rails on the ships.
There are many other versions of this knot here on Instructables.com, but this is the way I learned how to do it.
The photo shows 3 projects that can easily be made using this method.
The left one is a simple key fob, I just forgot to put a key ring on the end.
The middle is a cover for my scissors.
The right is my awl that has been covered with cord.