Reading the replies in this thread got me thinking it would be nice if an online course site allowed searching within all the subtitles of all the videos it hos

Reading the replies in this thread got me thinking it would be nice if an online course site allowed searching within all the subtitles of all the videos it hosts, and would provide results to all videos containing the searched keyword so you could get access to many explanations and side-notes about a concept, fast.. I think it goes against their business model though. Also, many MOOCs do support optional texts, but they are not always free. Perhaps the right mix is somewhere down the middle.. a course that gives you all the course materials in a jupyter notebook + makes help videos available as well, and the student can pick their desired learning path (like http://cs109.github.io/2015/pages/videos.html http://cs109.github.io/2015/pages/videos.html) Finally, I really like those "Manga guide to" books from No Starch Press, but they are more like fun supplementary resources.