BookintermediateFree
Fourier Analysis
T.W. Körner
Fourier Analysis - A book resource
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More resources on Fourier Transforms
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Harmonic Analysis Resources
Curated list from MathOverflow/Reddit
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Fourier Analysis Notes
Terry Tao's notes on harmonic analysis
WebsiteFree
Pauls Online Math Notes - Fourier Series
Free comprehensive notes
VideoFree
Fourier Series and Transforms
Detailed practitioner rec from r/math
VideoFree
Fourier Transform Introduction
Brilliant overview with harmonic analysis basics
WebsiteFree
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.