Khan Academy — Math
Free, self-paced math courses from basic arithmetic through multivariable calculus, linear algebra, and differential equations.
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Public VaultMathematics
Math From Zero to Calc
Algebra to multivariable calculus — free courses, video series, graphing tools, and step-by-step solvers that actually explain the why.
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3Blue1Brown
Visual, intuitive explanations of calculus, linear algebra, neural networks, and more. Watch the "Essence of Calculus" series first.
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Paul's Online Math Notes
Legendary free notes for Algebra, Calc I, Calc II, Calc III, and Differential Equations. Often clearer than the assigned textbook.
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Desmos Graphing Calculator
The best free graphing calculator on the web. Visualize functions, explore transformations, and check your work instantly.
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Wolfram Alpha
Step-by-step solutions to math problems — not just the answer but the full working. Essential for checking work and learning methods.
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Professor Leonard (YouTube)
Full university-level math lecture series on YouTube: Precalculus, Calc I/II/III, Statistics, Differential Equations. Best free professor online.
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MIT OCW — Mathematics
MIT's full math course catalog with lecture notes, assignments, and exams. Especially strong for linear algebra and real analysis.
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PatrickJMT
Thousands of short, focused math tutorial videos organized by topic. Perfect for quickly understanding a concept before a test.
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