It really depends upon the subject matter - we're experimenting! For Computer Science/programming education we've been pushing more towards the text/interactive exercise direction. Art History is almost all text and videos (with little interaction). Math is almost all video and exercises (no text).

We also have pieces like Cryptography and Information Theory which are video heavy and have some interactive portions: https://www.khanacademy.org/computing/computer-science/crypt... https://www.khanacademy.org/computing/computer-science/infor...

Hope you find some of them interesting!