ocw.mit.edu
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MIT OpenCourseWare (OCW) offers free, openly licensed course materials from a wide range of MIT classes, including lecture notes, assignments, exams, and videos. It’s a self-paced resource for learning topics like Fourier transforms and related subjects across engineering and mathematics.
More resources on Fourier Transforms
Harmonic Analysis Resources
Curated list from MathOverflow/Reddit
Fourier Analysis Notes
Terry Tao's notes on harmonic analysis
Pauls Online Math Notes - Fourier Series
Free comprehensive notes
Fourier Series and Transforms
Detailed practitioner rec from r/math
Fourier Transform Introduction
Brilliant overview with harmonic analysis basics
mathworld.wolfram.com
MathWorld is Wolfram's comprehensive online mathematics encyclopedia, offering detailed, rigorously written articles on a wide range of math topics. Its Fourier Transform entries cover continuous and discrete transforms, key properties, transform pairs, formulas, examples, and related concepts and applications.