As the title suggests, this is a complete grammar "master" course. There is also a device that can correct the laziness that is a shortcoming of online learning by taking tests every two weeks. The contents related to memory learning for non-majors were really good. Thanks to this, I was able to deeply understand the parts about why it had to be that way. The lecture materials are also of a high level, so I don't think I need to buy another textbook.