I'm trying to learn about Fourier Transforms, specifically how they relate to equalizers, but I can't seem to find any academic guidance. I've asked my maths teacher for help, and I've looked through my school library, but I can't find a single source to start learning about Fourier Transforms. I've looked online at places like Wikipedia and Wolfram, but those websites don't explain the Fourier Transforms starting from a simple enough position, and I can't start to understand them. Where can I look to start learning? I need to have a fairly good understanding of the derivation of the Fourier Transforms as well as how they work/how to use them. Any help will be greatly appreciated!