To be able to maintain control over the basketball whilst moving around in different directions and sight whats in front of us

What part of the hand do we use when dribbling the basketball? Why? (the finger tips - gives us more control)
What height do we dribble the basketball up to in reference with our body? Why? (waist height, at this height we are able to look at where we are dribbling and whats in front of us on the court - identify: defenders, attackers, hoop)