It is important to understand how to balance props in order to avoid instability in the flight of your drone.
If you propellors are not balanced you will find your quadcopter experiencing a bumpy ride. Not only will it be harder to fly, it will be more at risk of inflight damage and those great videos you are trying to take will appear very shaky.
What will you need? Just a some tape, your propellors, and the video below.
Now, learn how to balance props in this brief video from Dino at Skylab Flight Systems.