This is a short series of review material on Fourier series, Fourier transforms and the Discreet Fourier Transform (DFT) for digital signal processing.
They are an adaptation of a 3 hour long talk that I gave at CASPER 2019 Workshop at Harvard University.
If you’re confused about which one you really need, here is a quick overview of what is what.
If you would rather see my talk slides; here is the one on Fourier Series and Transforms and here is the one on Sampling, DTFT, DFT and FFT.