This glitch allows you to travel crazy distances really fast and super easily. All you need is a damage source and a Deku flower. Get on top of the Deku flower, keep holding R and buffer until the frame before you get hit (2nd big red flash with a bomb, works better) or the frame after, unpause and hold A and R and you'll be sent backwards super fast. It can also be done unbuffered.
By doing Flower Sliding in North Clock Town, you can get past the guard and get into the loading zone that leads to Termina.