When I listen to other lectures, there are many cases where the explanation of the class materials is insufficient, so even if I google and refer to other materials. There were many times when I had difficulty understanding. It is hard to find good materials, Whenever I look at instructor Kim Young-han's (developer) class materials, I am amazed by the details. I don't remember ever googled because the explanation was insufficient. Thank you for the good materials and class contents. I will apply it to my work and do well!!! Thank you again!!! I am a subscriber to the development floor, and I really enjoyed watching 'Rural Youth Becomes the King of Development'!!! I thought I only took the elite course from the beginning, but I could see the time of effort. I look forward to more good lectures in the future.