ncatlab.org
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nLab is a collaborative online wiki serving as a reference for higher mathematics and theoretical physics, with extensive, interlinked articles on category theory, topology, algebraic geometry, and related topics. It includes deep entries on moduli spaces, stacks, and other foundational concepts, along with definitions, discussions, and links to literature.
More resources on Moduli Spaces
nLab - Moduli Space
Higher category theory perspective on moduli spaces
Stacks Project - Moduli Stacks
Comprehensive free reference on algebraic stacks and moduli
Lectures on Moduli Spaces
Learn about moduli spaces with Bhargav Bhatt's lectures! Explore deformation theory and geometric structures in this insightful course.
mathworld.wolfram.com
MathWorld is Wolfram’s extensive online mathematics encyclopedia offering concise, well-structured articles on a wide range of topics, including definitions, theorems, formulas, and worked examples with diagrams. It includes topic pages (such as moduli spaces), cross-references, figures, and links to related concepts for quick learning and reference.
The Geometry of Moduli Spaces of Sheaves
The Geometry of Moduli Spaces of Sheaves - A book resource
ocw.mit.edu
MIT OpenCourseWare provides free, openly accessible MIT course materials—lectures, notes, assignments, and exams—across a wide range of subjects. This makes it a valuable resource for self-paced study in mathematics, including topics related to moduli spaces.