Aeromodelling has different things to learn. Either you would be interested in learning how to design an aircraft, or how to fabricate an aircraft, or how to fly an aircraft. So these are the different fields which comes under aeromodelling. Before you start fabricating your own aircraft, you need to go through some basic theories which would obviously interest you, like what are the different forces that act on an airplane when it is in air, how can it be steered through air, learn about different parts of a drone and functions of each parts.