Although it is a free basic course, it is an in-depth course with a level of difficulty that is by no means easy! Furthermore, the content of the course is not just about simple technical knowledge, but also about content that can be used in the field (practical work), so I think the quality is very high. Since it is difficult, there are parts that are difficult to understand after listening to it once, so I think repetition is essential. Thank you so much for the great course.