You only have to know one thing:
YOU CAN LEARN ANYTHING!
For free. For everyone. Forever.
Take control of your learning by working on the skills you choose at your own pace.
Sharpen your skills with over 100,000 interactive exercises.
Math, science, computer programming, history, art, economics, and more.
No ads, no subscriptions. We are a not‑for‑profit because we believe in a free, world-class education for anyone, anywhere.
Start learning now.
If you have technical difficulties, visit Khan Academy's support page