ncatlab.org
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nLab is a collaborative online knowledge base for mathematics, focusing on category theory and related areas, with wiki-style pages containing definitions, explanations, and references. It covers topics from higher category theory and topos theory to algebraic geometry, homotopy theory, and derived geometry, featuring extensive cross-links and discussions.
More resources on Algebraic Varieties
Algebraic Geometry Notes by Johan de Jong
Lecture notes on varieties
Ravi Vakil's Notes
Foundations of Algebraic Geometry notes
The Stacks Project
Comprehensive free online resource on algebraic geometry
Algebraic Geometry
Learn about algebraic varieties with Lars Tyge Jensen's course on Algebraic Geometry. Explore key concepts & deepen your understanding!
Algebraic Geometry
Algebraic Geometry - A book resource
mathworld.wolfram.com
MathWorld is Wolfram’s comprehensive online math encyclopedia offering concise, self-contained articles on mathematical topics, including algebraic geometry and algebraic varieties, with definitions, theorems, properties, formulas, and examples.