Here is a YouTube video about Demodulating an AM Radio Signal in an SDR, and is part of a growing collection of videos I have found to be useful. The reason is illustrate using the Fourier transform and a DSP algo to demodulate and filter an AM radio signal and understanding science related to software defined radio.
This tutorial, "Demodulating an AM Radio Signal in an SDR" 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.