nptel.ac.in
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NPTEL is a government-backed online learning platform hosting free video lectures and course materials from IITs and other institutes. It offers a wide range of math and engineering courses, including topics related to harmonic functions, with lecture videos, downloadable notes, assignments, and quizzes.
More resources on Harmonic Functions
Harmonic Function Theory
Harmonic Function Theory - A book resource
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia by Wolfram, offering detailed articles, definitions, theorems, formulas, and illustrative diagrams across all branches of math. It includes topic pages on harmonic functions with explanations, examples, proofs, and links to related concepts and references.
ocw.mit.edu
MIT OpenCourseWare provides free, openly licensed MIT course materials—including mathematics lectures, notes, assignments, and exams—so you can explore harmonic functions topics and related content.