I want to know the different fields in Aeronautics?

Inside Aeronautics, Aviation and Aerospace Science
The fields of aeronautics, aviation and aerospace science encompass designing, building, maintaining and testing all kinds of aircraft and spacecraft, from small planes to rockets and orbiters. Professionals in these fields have often been trained in aviation technology, aerospace systems engineering, aerospace physics, navigation systems, space flight operations and aircraft performance. They are also familiar with aviation management and safety guidelines

Coming to the Education bit of if :
Bachelor's degree in aerospace engineering, although pursuing a master's degree in aeronautic engineering will improve job opportunities.
Skills in math and physical science, mechanical and technical skills, writing and business knowledge, analytical, critical-thinking, and the ability to work well with others.Individuals who have an interest in becoming an aeronautic engineer are encouraged to prepare for the career path well in advance by focusing their studies on science and mathematics in high school. Bachelor's degrees in fields relating to aerospace engineering are typically required of aeronautic engineers. Some firms may be willing to accept applicants who hold related engineering or science degrees. Opportunities for employment increase for those with a master's degree in aeronautic engineering. Some colleges and universities offer cooperative programs or internship opportunities that allow students to gain hands-on experience as they finish their degree programs. No licensing is required for entry-level engineering positions; however, engineers in higher-level positions must be licensed as professional engineers.