RAG, vector DBs & enterprise search

Embeddings — turning text into geometry

Chunking — the silent quality lever

Vector stores compared

Hybrid search & query rewriting

Re-ranking with cross-encoders

Eval — Ragas, TruLens, Phoenix, DeepEval

Advanced patterns — Agentic RAG, GraphRAG, Multimodal, CAG

Production observability + cost

Embedding migration & versioning

Production hardening — PII, prompt injection, multi-tenancy