Grit is defined as persevering towards long-term goals despite challenges or setbacks. The document discusses how grit is more important than other factors like intelligence or talent for success. It provides tips for developing grit such as pursuing passions, practicing skills, sticking with goals despite difficulties, finding support, and maintaining a constructive mindset. Examples are given of historically gritty people like Edison, Michelangelo, and Rowling who persisted through obstacles. The conclusion emphasizes developing grit can create meaningful results in both personal and professional life.