With a fixed mindset, you believe your talents, skills, abilities, intelligence, and character are fixed. You think they don't change throughout your life and thus perceive talent (i.e., what you're born with) as the key to achievement.
A growth mindset is the opposite. You believe everything from your intelligence and capabilities to your overall lot in life is subject to change. With time and effort, anything's possible; it's up to you to make it happen.
Whether you've been struggling to pay off your credit card debt, save for retirement, or are unable to summon the courage to ask for a raise, a growth mindset should make it easier to acknowledge the problem and take the first steps to address it.