Calculus

The single best visual introduction to calculus. Builds intuition for derivatives and integrals from scratch with beautiful animations. Watch this before anything else.

University-level lectures covering single and multivariable calculus in full. Long but thorough — the closest thing to a free university course on YouTube.

Hundreds of worked examples covering every calculus topic. Best used alongside a textbook when you need to see a specific technique done step by step.

Full MIT lecture series on multivariable calculus with Denis Auroux. Covers partial derivatives, multiple integrals, vector fields, and Stokes' theorem.

Full MIT course with lecture notes, problem sets, and exams. Free to access. One of the most rigorous introductions to single variable calculus available online.

Structured, self-paced calculus from limits through integration. Good for filling in gaps or going back to basics. The exercises are particularly useful.

Comprehensive written notes covering Calculus I, II, and III with worked examples. One of the most-referenced free calculus resources on the internet. Great as a reference while studying.

Intuition-first explanations of calculus concepts. Kalid Azad writes about the ideas behind the math in a way that actually makes them stick.