It is very good for learning Hadoop basics, installation methods, and environment configuration. It is a lecture that organizes basic MapReduce development in Python and Java step by step, so it is easy to follow and less burdensome. However, since the instructor lives abroad, the native pronunciation is somewhat difficult to hear, and some terms do not match the Korean pronunciation, so it can be confusing (Maven: Maven, Cobic: Covid) And the word order in which it is explained is often unfamiliar, with the subject coming last, so it can be difficult to understand what is being explained. ex) A is B and C and has D characteristics -> A with D characteristics of B and C (I think this is probably because Koreans are not familiar with English word order) Excluding these parts, I recommend it to those who are just starting out with Hadoop basics.