For those interested in pursuing a career in cosmology, majoring in physics or astrophysics is highly recommended, as these fields provide essential knowledge in both theoretical and observational aspects of the discipline. While pure mathematics is valuable for developing analytical skills, it is not sufficient alone for a career in cosmology. A combination of physics and astronomy is ideal, with many institutions offering programs that blend these areas. The distinction between astronomy and astrophysics is often blurred, with both requiring a solid foundation in physics. Aspiring theorists may benefit from a double major in physics and mathematics, while those leaning towards observational roles should focus on astronomy. Ultimately, the best choice of major may depend on the specific offerings and strengths of the institution. Reading biographies of established cosmologists can provide insights into successful educational paths.