Guides
Reference & Learning
Living documents covering fundamental concepts, tools, and techniques. Unlike articles, these are regularly updated as understanding evolves.
Reciprocal Rank Fusion for Hybrid Search
Updated FEB 14, 2026
A comprehensive guide to using Reciprocal Rank Fusion (RRF) to combine BM25 and semantic search results for production RAG systems.
BM25 Search in LLM Systems
Updated DEC 22, 2025
A comprehensive, interactive guide to understanding the BM25 ranking algorithm for AI engineers building RAG systems and search applications.