Book excerpt: In a constantly growing aeronautical industry, the demand for professional pilots is increasing. Year after year thousands of applicants come to the airlines looking for a job, but only a small fraction of them get the job, and of that small fraction, only a very select group are the pilots who manage to develop their professional careers in a company. The other pilots don't get achieve their goals for different reasons, one of them is the lack of knowledge that leads them to face challenges that they cannot overcome. In this guide we will try to provide each reader with the necessary tools to learn all the most relevant aspects of one of the most flying commercial aircraft in the world. A complete guide that covers the knowledge of all the aircraft's systems, the Airbus flight philosophy, and a complete analysis of the operation of the FMS flight system where the reader will learn to operate the flight computer effectively and in various situations that may occur in real life. Finally you will learn all about a normal operation in a complete day as a pilot in command of A320. After learning the contents of this A320 encyclopedia, the pilot will arrive at the new job with a solid knowledge of the aircraft he will fly and this will make his learning process within the airline reach the highest academic and professional level.