The correct answer is Balance.
Someone can coordinate, agilitate, and have power on bicycling but balancing is the common thing which a person can have more concern with.
There are essentials which are used in cycling skills. For example, shifting, pedaling, descending, braking, and balance.
The only way to make it easy for the road not the down side of the road, or certain obstacle which you are trying to avoid. This keeps you from unnecessary accidents and helps on steering.