Real MIT course materials, openly published.
Lecture notes, assignments and exams from thousands of MIT courses, including psychology, linear algebra and machine learning. Use the syllabi to build a self-study plan with real rigour.
Thousands of hours of coding lessons and certifications.
Interactive course · BSD / open
The best introduction to computer science, free to audit.
Video course · Creative Commons
Maths, science and economics from basics to advanced.
Course platform · Free tier — no card required
How valid tests are actually built and validated.
Open textbook · Creative Commons
Free courses, frequency lists and spaced repetition.
App + decks · AGPL / open source
Measurable typing improvement in minutes a day.
Web app · GPL / open source
The decks that raised money, page by page.
PDF collection · Publicly shared
Official targeting, budget and measurement training.
Course · Free tier — no card required
Track what matters and read the numbers correctly.
Course · Free tier — no card required
