5. Khan Academy

Khan Academy is a free site that will teach you anything you'd like. According to them, there are "no ads, no subscriptions. We are a not‑for‑profit because we believe in a free, world-class education for anyone, anywhere." If you visit the site, you can look up information about algebra, biology, or art history. You could play over 100,000 interactive exercises. You could learn whatever you wanted, whenever you wanted!
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