I was studying scss on my own by reading books, but there were so many parts I didn't understand, so I took the lecture. It was good because I was able to learn new grammar that was not the CSS I often used, and anyone who knows CSS to some extent can learn it easily. However, for those who have a good understanding of existing CSS, the lecture might feel a bit loose, and the sound is a bit low, so you should turn up the volume in the sound settings to around 100 and listen, and the speech is a bit slow, so I recommend listening at a higher speed.