mathworld.wolfram.com
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MathWorld is Wolfram's comprehensive online mathematics encyclopedia, offering in-depth, formally written articles on a broad range of mathematical topics. It features definitions, explanations, formulas, diagrams, and references—with extensive entries on sets, operations, algebra, and other core areas.
More resources on Sets & Operations
Brilliant.org Sets
Interactive problems on set operations
Wikipedia: Set Theory
Comprehensive overview of sets and operations
Set Theory Playlist
Learn set theory and operations with Dr. Trefor Bazett! This course covers the fundamentals for math, computer science, and more.
Introduction to Mathematical Thinking
Learn how to think the way mathematicians do – a powerful cognitive process developed over thousands of years. Mathematical thinking is not the same as doing mathematics – at least not as mathematics is typically presented in our school system. School math typically focuses on learning procedures to solve highly stereotyped problems. Professional mathematicians think a certain way to solve real problems, problems that can arise from the everyday world, or from science, or from within mathematics itself. The key to success in school math is to learn to think inside-the-box. In contrast, a key feature of mathematical thinking is thinking outside-the-box – a valuable ability in today’s world. This course helps to develop that crucial way of thinking.
Set Theory: An Introduction to Independence Proofs
Set Theory: An Introduction to Independence Proofs - A book resource
ocw.mit.edu
MIT OpenCourseWare offers free, openly licensed MIT course materials across disciplines, including mathematics courses that cover sets, set operations, and discrete math, with lecture notes, problem sets, exams, and video lectures.