If anyone wants to understand the Fourier transform, I can recommend the book "Who is Fourier: a mathematical adventure". It is supposed to be a children's book

If anyone wants to understand the Fourier transform, I can recommend the book "Who is Fourier: a mathematical adventure". It is supposed to be a children's book. It was very clear and intuitive. https://www.goodreads.com/book/show/6969906-who-is-fourier https://www.goodreads.com/book/show/6969906-who-is-fourier