Here is a YouTube video about Intuitive Understanding of the Fourier Transform and FFTs, and is part of a growing collection of videos I have found to be useful. The reason is how to use FFTs for animations in Python code and understanding science related to software defined radio.
This tutorial, "Intuitive Understanding of the Fourier Transform and FFTs" 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.