Free Resources
Quality learning resources that won't cost you a penny. From video courses to free textbooks to community forums.
General
3Blue1Brown
VideoBeautiful visual explanations of math concepts including linear algebra, calculus, and neural networks.
Khan Academy
VideoFree comprehensive courses from arithmetic through calculus, linear algebra, and beyond.
Math is Power 4U
VideoThousands of short, focused videos on specific math topics from algebra through calculus.
OpenStax Textbooks
ReadingFree, peer-reviewed textbooks including algebra, precalculus, calculus, and statistics.
Brilliant.org
InteractiveInteractive problem-solving courses for math and science (freemium).
University Courses
MIT OpenCourseWare
VideoFree university-level courses from MIT including 18.01, 18.02, 18.03, 18.06, and more.
AMS Open Math Notes
ReadingCourse notes from mathematicians on various advanced topics.
Calculus
Professor Leonard
VideoFull-length lecture videos covering precalculus, calculus, and differential equations.
blackpenredpen
VideoCalculus problem-solving videos with clear explanations and challenge problems.
Paul's Online Math Notes
ReadingComprehensive notes on algebra, calculus, and differential equations with practice problems.
Precalculus
Problem Solving
Project Euler
InteractiveChallenging mathematical/computer programming problems requiring more than math knowledge.
Art of Problem Solving
InteractiveResources for competition math and advanced problem-solving (some free content).
Tools
Mathway
ToolProblem solver that shows step-by-step solutions for various math topics.
Wolfram Alpha
ToolComputational knowledge engine - great for checking work and exploring math.
Community
Mathematics Stack Exchange
CommunityQ&A community for people studying math at any level and professionals.
MathOverflow
CommunityQ&A for professional mathematicians - great for research-level questions.
r/learnmath & r/math
CommunityActive Reddit communities for learning math and discussing mathematics.
Linear Algebra
Abstract Algebra
Analysis
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