Here is a YouTube video about AM Radio Explained With the Fourier Transform Part 1, and is part of a growing collection of videos I have found to be useful. The reason is show how the Fourier transform mathematically explains amplitide modulated radio signals and understanding science related to software defined radio.
This tutorial, "AM Radio Explained With the Fourier Transform Part 1" is free education you can watch, which will help you deepen your knowledge and be better prepared for licence exams, schoolwork, or operating radio equipment.