Great lecture It's quite different from the Java lectures I've taken so far. If most lectures start from the basics, I can say that this lecture covers the core context. Honestly, if you search for Java lectures on YouTube, you'll see a lot about variables and arrays. I recommend it because it helps students focus more on parts that they're confused about, such as callbacks and scopes, and parts that they need to think about more. In fact, since he's not a professional instructor or professor, the way he explains the lectures may seem unfamiliar. I thought it was surprisingly refreshing and good.