Is there a clear explanation of the Closure Table algorithm somewhere?

Question

Algorithms

Good time, comrades, I'm
looking for the easiest way to store and manage trees in mysql . I
came across Closure Table
. Not only can I not fully understand how it is drawn, I have not seen a clear example anywhere about editing a tree, moving a node, adding a node, etc.
Please give options where it is chewed as much as possible, thanks