nptel.ac.in
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NPTEL is a government-backed online learning platform offering free and paid courses in engineering, science, and humanities from IITs and IISc, with video lectures, notes, assignments, and certificates. It hosts a wide range of course content across disciplines, including mathematics and computer science topics that cover concepts like cardinality.
More resources on Cardinality
nLab: Cardinality
Advanced category-theoretic perspective
Stanford Encyclopedia of Philosophy: Set Theory
Comprehensive entry on set theory including cardinality
Hilbert's Infinite Hotel Paradox
Numberphile on countability
How To Count Past Infinity
Vsauce explains countable and uncountable infinities
Set Theory
Learn set theory & explore cardinality with Dr. Trefor Bazett's course. Master the fundamentals through this accessible YouTube playlist!
mathworld.wolfram.com
MathWorld is Wolfram's comprehensive online math encyclopedia with in-depth articles on topics across mathematics, including cardinality. Each article offers clear definitions, explanations, formulas, examples, and diagrams to help you understand the concept.