"Essential lecture for Android developers" Many of you may agree, but learning Android through YouTube lectures or Googling is like collecting dragon balls, collecting a lot of pieces of information. It is hard to feel like you are truly learning with your own knowledge. However, this lecture provides many things that Android developers need to know, one by one, from the basics. It also helps you learn detailed things such as how to use official documents and coding conventions, so even though I am still a job seeker (unemployed), I feel like I have a great mentor. If you are seriously considering a career as an Android developer, I definitely recommend purchasing it. I bought it after seeing the great curriculum, and I am very satisfied. [Recommended for purchase] 1. Developers who struggle to create projects while Googling, but always have ambiguous results 2. Major students who lack the basics and don't know how to learn 3. Anyone who has a mentor who only tells you to refer to the official documents without looking at the official documents themselves