I think it's great because you explain Java and Spring in an easy-to-understand way.

Please make it easy and friendly, while firmly establishing the basics from the ground up.

Good!

I've listened to all of parts 1, 1.5, and 2, and it's a very ambiguous lecture series. Ultimately, across parts 1 -> 1.5 -> 2, you only write a very, very simple piece of code called "Product" and a tiny amount of code in general, so it feels somewhat lacking... In part 2, you don't even start writing actual code until Chapter 6, and even then, it's only about one or two lines... I feel like I typed less than 100 characters by the time the chapter ended. When considering the total cost of purchasing parts 1 + 1.5 + 2, I wouldn't recommend it to those around me, but since it's not like the instructor is bad at teaching, it's a truly ambiguous lecture series.