People's core attitudes fall into one of two categories: a fixed mindset or a growth mindset. With a fixed mindset, you believe you are who you are and you cannot change. This creates problems when you're challenged, because anything that appears to be more than you can handle is bound to make you feel hopeless and overwhelmed. People with a growth mindset believe that they can improve with effort. This makes them happier because they are better at handling difficulties. They also outperform those with a fixed mindset because they embrace challenges, treating them as opportunities to learn something new.