This is a really useful lecture that explains various visualization methods and preprocessing processes in a practical way. When introducing a library, it always tells you how to read the help, so it was really good that I knew how to deal with things that I didn't know when I was working alone. In particular, after listening to the lecture "Unraveling Data Analysis and Visualization with Just Two Documents" and listening to this, I could feel the synergy effect of organizing it more systematically ^^ This is a very helpful lecture for those who don't know how to do projects and portfolios.