In my personal experience, I find extremely difficult to stick with the courses that are mostly video based. Not just from OCW but Coursera, edX, etc.

But what I found is that, for me, a really good way to start learning a new subject is studying from Lecture Notes.

These are generally less dense and more tractable than a whole textbook, and at the same time, you get the written form which I find a bit easier to follow than multiple hours of video.

Of course you miss the depth in some cases, but as introductory content I find them really to the point and easing the learning curve.