Introduction Happy coding! Today I want to share a practical AI tutorial in .NET style, with real code, simple architecture, and a result you can run on your own machine. When many developers start building AI knowledge assistants, the first idea is usually RAG . That is a good choice in many cases, but not always the simplest one. Sometimes, your knowledge base is actually small, focused, and stable. In that lovely situation, building a small LLM Wiki can be a more elegant choice. Let me tell a short lovely story. Imagine a small tea house run by a kind grandmother. Every morning, her grandchildren ask the same questions: Which tea is good for a cold day? Which dessert has nuts? What is the house special today? Now imagine two ways to help them. The first way is to hire a fast librarian who runs to a giant archive room every time a child asks a question. That is a bit like RAG . The second way is to write one beautiful, well-organized family handbook and keep it on the table all the time.…