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1. Cộng đồng
2. Content Requests and Feedback
3. Proofs

I'm aware that exists. But some people like me don't learn easily from textbooks and Google searches. Khan Academy has the videos and interactive resources that make it so much easier to learn thin...

1. Cộng đồng
2. Feature Requests and General Site Feedback
3. Multiple choice/all that apply questions

You've got a point, but it doesn't really count it as correct. And it also lets them see they aren't getting it fully, and gets them to think about it more to get the right answer.