You are right usually free courses are not that good though you can still get good information from there but only a few but unlike this course they cover mostly and the quality of information is also good I just hope they could give another courses again.
It is rare to find free courses of high quality and have information like that, such free courses. Well, maybe there are one or two free courses of high quality but the rest of the free courses need to pay to watch the next courses. If that can attract people's attention and demand from the audience, another video will launch soon.