ncatlab.org
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nLab is a collaborative, wiki-style knowledge base focused on category theory, higher category theory, algebraic topology, and related areas. It provides in-depth definitions, explanations, and cross-referenced articles on topics such as tensor products, monoidal categories, enriched categories, and other foundational concepts, with links to further reading.
More resources on Tensor Products
nLab: Representation Theory
Detailed notes on tensor products of representations
Introduction to Representation Theory (free PDF)
Free textbook covering tensor products extensively, highly recommended on r/math
Representation Theory of Finite Groups
Learn tensor products in representation theory of finite groups with this course by Richard Borcherds! Dive into group representations now.
mathworld.wolfram.com
MathWorld is Wolfram's comprehensive online mathematics encyclopedia with concise, rigorously written articles, definitions, theorems, formulas, and examples across topics. It includes detailed entries on tensor products with explanations and related concepts.
ocw.mit.edu
MIT OpenCourseWare is a free, openly accessible repository of MIT course materials across disciplines. It offers complete courses with lecture notes, assignments, exams, and often video lectures, including math courses that cover topics like tensor products.