Hello, I've been interested in Spring AI for about 6 months now, and thank you so much for creating this course. I think the most useful parts will be the RAG system and the chatbot using it. With the RAG system, I won't need to constantly ask GPT questions, and as long as the data doesn't change, there shouldn't be any costs incurred... It's fun looking up background knowledge here and there while taking your course. Thank you! I'll be waiting for part 2!