I urgently needed to create a POC for a RAG project that came up suddenly, and while looking for suitable lectures, I tried a preview lecture and immediately purchased the roadmap. I quickly went through it once without hands-on practice, just to skim through the concepts. Since I started using cloud code, I felt like I could build anything on my own. Now I truly feel like I can build anything. The project contract cost (with the project contract being certain if I just create a good POC) is hundreds of times more than the instructor's roadmap cost - I don't know where else you can find such cost-effectiveness. Here are the lecture advantages I experienced: 1. Clear pronunciation and good delivery. 2. It's realistic because it contains processes with mistakes/typos rather than being a perfect lecture without any errors. 3. References documents including papers are mentioned. 4. Introduces various tips that can only be known through actual work experience (line breaks in pdf parsing/prompt writing/table and image processing...). 5. English pronunciation isn't strange? (Many instructors pronounce basic English words ridiculously, which was often bothersome, but there were no such cases here) 6. Important concepts are repeated dozens of times. You'll understand eventually. When I first listened to the LangGraph lecture and heard mentions of edge/node/state, I wondered what it was about. But just watching the same process being created hundreds of times, I think I roughly understand it now. I usually don't leave course reviews, but I strongly recommend this for those learning langchain/langgraph/rag.