Hello leoceokj! It seems the lecture content was not satisfactory for you 😭 I always try to produce lecture content from the perspective of beginners and non-majors, so it seems the needs were not quite met 😢 If you could let me know what was unsatisfactory, it would be helpful in developing the lecture further. Could you please provide feedback via email, even just a brief note?? My email is kkj6369@naver.com. Thank you!!!