Shield Surfing is a skill that Link could use in snowy and grassy slopes. You can shield-surf in slopes by holding your shield out and then run towards the slope and Link will automatically shield-surf.
Avoid rocky terrains as big rocks can deplete shield durability. Also, shields with high durability are the only ones that you can use for shield-surfing if you want to go for long distances. Press the Y button to execute a 1080 spin while shield-surfing, then press the X button and move the left analog stick sideways to perform tricks.