I think youtube is one of the best platform to learn manythings.we will get almost all topics of wide range here.
even if the speed of the langauge by a partcular person is either too slow or fast we can convert into our desired speed by option speed in settings .
also we have automatic subtitles for the latest videos which also makes it easier for us to understand.
we can see in theatre mode, full screen and even many a times it does open in poor internet connections also.
we can earn money too by uploading the videos and reaching particular views.