The examples are so good. Just by playing around with the examples provided by the instructor, I was able to easily understand the what, why, and how parts of the concepts, and by looking at the way the examples gradually developed, I was able to see the big picture that Spring intended. Thank you for saving my time. I would like to give you feedback, but I have nothing to say because I only received help from the macro to the detailed parts (like IntelliJ shortcuts).