Shameless plug of my own explanation on how binary fields work: https://vitalik.ca/general/2019/05/12/fft.html https://vitalik.ca/general/2019/05/12/fft.html

Shameless plug of my own explanation on how binary fields work: https://vitalik.ca/general/2019/05/12/fft.html https://vitalik.ca/general/2019/05/12/fft.html Ctrl+F for "binary fields".