We often think of investments as stocks, bonds, and mutual funds. But we make a lot of different types of investments in our lives: We invest in people and relationships, we invest in jobs, and we invest in ourselves. A great way to invest in yourself is to continue learning throughout your life. By learning, you can add more skills (and even certifications and professional designations) to your resume, helping you climb the career ladder – or change careers. Through learning, you can also gain insight into human nature and how to be more successful in life.