This is a really good lecture for beginners in algorithms. I read the reviews before taking the lecture, but since they are subjective, they may differ, but you don't need to refer to the reviews with low stars. They say that it is insincere to draw and explain with a drawing program, but if you take the lecture yourself, there will be no problem at all. The instructor repeatedly explains it in an easy way so that even beginners can understand, so I recommend it to beginners in algorithms.