It only covers very, very basic parts. In particular, trees and graphs are explained with only a little bit of theory. Let's quickly review with the Javascript 30-minute summary lecture! part is about basic JavaScript grammar, but I don't know why it's here. Unlike the lecture title, 'I opened my eyes and it was the day before the coding test,' it doesn't seem like it would be particularly helpful if you watch it the day before the test. It's a helpful class for people who want to learn the basics, but I think it's better for JavaScript users to just search on Google. It can be even more confusing because the JavaScript code is written like Python. I didn't look at the Python part, so I don't know what it's like.