In the early 2000’s, many universities around the world started to put out audio and video recordings of entire courses online (many on ‘itunes university’). While jogging or driving, if you enjoyed listening to the cadence of university professors interacting with their classes as they systematically covered many topics over series of lectures, then the possibilities were endless. Their ‘heyday’ went on for about 10 years.
Itunes university is still around, and some institutions are still putting out content, but many have withdrawn from this (some even taking down content they had previously made accessible). The so-called “MOOCs” that are now widely available fill some of this gap, but not completely, particularly if the long audio form is your preferred form of consumption. And MOOCs seem to emphasize technical subjects (nothing wrong with that, but offerings in history, philosophy, literature, political science, sociology, psychology are far fewer).
Many of the older courses are still available (and surprisingly don’t lose their freshness quickly, unlike much other content on the internet). Yale’s and MIT’s offerings are particularly good examples, where in addition to providing audio/video content, quite a bit of supplementary material is provided.