The beta is different from all the other platforms out there (edX, Coursera, Khan Academy, Udacity, etc.). We've done away with the lecture and made the learning more interactive. You can "choose your own adventure," and decide how to proceed through each lesson. You can go straight to the interactives, or jump back to earlier lessons needed to get through the next challenge. And as you learn, the platform will make recommendations and adapt to your unique style.
This is what you would see on your first visit, so it's recommending the "Introduction" lesson right now, where you can get a feel for how the platform works. Here's something you might see if you try out the lesson on graphing lines:
If you figure out the answer, then you would go ahead and type it in. And if you weren't sure, then clicking on the "I'm not sure..." option seamlessly breaks the question up into smaller parts, guiding you toward the answer.
Our goal is to make math (starting with calculus) a seamless, engaging experience. We're building out the platform more and more every day, and we'll be regularly adding content. Coming soon are some lessons on trigonometry, one of which will guide you through the proofs of over a dozen trig identities, in a way that's far more interactive than reading Wikipedia entries or watching Khan Academy videos.
And because this is a beta, we'd love as much feedback as possible. Let us know what you think!