Answer:
When set loose I fly away. Never so cursed as when I go astray.
kings and queens may cling to power and the jesters may have their call. I am the most common but I can rule them all.
I am three simple words everyone wants to hear. Three simple words such simple words and yet...life changing...
What can you break even if you never touch it?
I am the thing that is used to make your weight. What am I?
Give it food and it will live, give it water and it will die.