Although it's late, I've completed MVC1 following Spring's core principles 😳 When sending values to the server, I often saw 405, 500... I put this in and that in, and if the value was lucky enough to pass, it was the end, but after listening to the lecture, I experienced a new world 😱 It felt like they chewed it up and put it in my throat.. It was a great lecture that even I, who lacks comprehension skills, could understand easily 😳 To commemorate finishing MVC1, I'll review it and continue with MVC2. Thank you!! ps. Just buy Younghan's lecture without asking or questioning 😏