nLab - Moduli Space
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nLab wiki entry treating moduli spaces from a higher category theory viewpoint, framing them as classifying objects, stacks, and representing objects for families of structures. Readers with categorical background gain a conceptual map linking moduli problems to stacks and homotopy theory.
More resources on Moduli Spaces
Wolfram MathWorld
MathWorld is an online mathematics encyclopedia from Wolfram Research offering detailed, browsable articles on topics across the math spectrum, including algebra, geometry, calculus, and number theory. Each entry includes definitions, theorems, formulas, diagrams, worked examples, and links to further reading.
Stacks Project - Moduli Stacks
Section of the Stacks Project, the open, collaboratively written reference on algebraic geometry and algebraic stacks hosted at Columbia. Gives rigorous definitions and proofs, letting readers with scheme-theory background work through how moduli problems are formalised as algebraic stacks.
The Practice of Algebraic Curves: A Second Course in Algebraic Geometry
Second course on complex projective curves from two leading algebraic geometers: linear series, Riemann-Roch, curves of genus up to six, Jacobians, Hilbert schemes, moduli of curves, Severi varieties, dualizing sheaves and linkage in three-space. Fills the tier above Fulton and Miranda: how curve theory is actually used, with genus-by-genus classification and moduli.
The Geometry of Moduli Spaces of Sheaves
Graduate monograph on moduli of semistable coherent sheaves, covering Harder–Narasimhan and Jordan–Hölder filtrations, construction of moduli spaces via GIT, and sheaves on surfaces. Prepares readers to follow research on moduli of sheaves on K3 and other algebraic surfaces.
nLab
Collaborative wiki for mathematics, physics and philosophy written from a category-theoretic viewpoint, with cross-linked entries on categories, functors, adjunctions, topos theory, higher category theory and homotopy theory. Readers can look up precise definitions, examples and references for advanced structural mathematics.