Overview: This practical guide walks .NET Core developers from zero to production-ready LLM integration. It covers architecture, coding patterns, OpenAI/Azure/Anthropic/Ollama examples, streaming, retrieval-augmented generation (RAG), security, testing, deployment, observability, cost control, prompt engineering, FAQs and common interview questions. Prerequisites Architecture Patterns Project Setup (.NET 6/7/8) Core LLM Service Interface OpenAI [...]