It seems like a good lecture. Of course, from the middle to the latter part, the typing speed was very fast, so I had to stop or slow down to follow along. This lecture was announced in advance that a book was needed, and it felt more like an explanation than following along, It would have been better if the lecturer had explained things in detail while typing slowly. But it's okay. In the beginning, you should follow the basic grammar, and in the latter part, rather than following along, you should try to understand it by listening to the explanation. You don't need a book!