The lecture is good, but it is only an introductory class. Please purchase it knowing this. If you are someone who uses Ladies and Kafka in practice, you probably don't need to purchase it, and if you don't know anything at all, you can just buy it to skim the introductory course. And if you are a job seeker, if you write this much and write one line on your resume, you will be able to avoid in-depth questions during the interview. You should study separately.