The biggest risk is not taking any risk... In a world that changing really quickly; the only strategy that is guaranteed to fail is not taking risks.
Take chances; make mistakes. That's how you grow. Pain nourishes your courage. You have to fail in order to practice being brave.
Often the difference between a successful man and a failure is not one's better abilities or ideas; but the courage that one has to bet on his ideas; to take a calculated risk; and to act.