Kind and easy. You can experience what you need right away with the lecture notes. I really liked the quizzes in the middle to test my understanding. The video lectures are short, but they contain all the necessary content, so I understand. At first, I wondered, 'Why is it so short?' but my doubts were all resolved. The lectures are free of unnecessary elements, and they are the best. Because they are short, I can concentrate until the end, and I have the advantage of being able to organize the content and quickly review it before the next video.