u/Unstable007

I’m looking for the best free resources (websites, docs, courses, GitHub repos, YouTube, blogs) to learn RAG end-to-end — from fundamentals to advanced topics.
Interested in:
Types of RAG (Agentic, Graph, Multimodal, etc.)
Chunking, embeddings, retrieval, reranking
Vector DBs and frameworks
Evaluation and production best practices
Tools like LangChain, LlamaIndex, DSPy, etc.
I have a software engineering background, so technical/deep content is fine.
What resources helped you learn and build production-ready RAG systems?