It was good that I could learn the necessary grammar briefly The voice and lecture environment were also easy to listen to It is also good that it is not boring or drowsy The disadvantage is First, there is no time to actually use it It would be good to have problem solving and such, so that I could apply the grammar right away. It was disappointing that there was nothing like that Second, it is a lecture that was filmed a while ago, so it seems that the lecture content after ES6 is not reflected, so there are contents that do not match the present I wish there were updates about the changes Third, it is not always explained in the order in which the lecture materials are written, so there are times when I wonder where the code is There were these disappointing points, but anyway, it was okay to listen to.