Author: Jia Huang
I picked up RAG from First Principles because I’m fascinated by the potential of Retrieval-Augmented Generation (RAG) systems in AI, and I wanted to go deeper into the underlying principles and frameworks that make RAG tick, past the usual surface-level tutorials.
The book covers the basics of RAG, from building evaluation datasets to implementing retrieval and response evaluation frameworks. Huang does a solid job explaining why context relevance, retrieval precision, and recall matter so much in RAG system evaluation. I particularly appreciated the discussion on handling different data sources and formats, which is a crucial (and often underestimated) part of any real RAG project.
One standout for me was the chapter on building a dataset from scratch. Huang’s advice on starting with around 200 Q&A entries and gradually accumulating more content is a genuinely useful, practical approach, one I can see working well in real-world projects rather than just in a lab setup.
If you’re working with large language models or building AI-powered applications, this book is worth your time. The technical content is solid, and the way the author uses generative AI tools to assist with ideation and phrasing is a nice touch that fits the subject matter.
My main takeaway is that RAG systems demand a real understanding of the evaluation frameworks and data foundations behind them. Following the principles Huang lays out here can help developers build RAG systems that are more effective and deliver consistently better results.
Get your copy of RAG from First Principles if you want to understand RAG beyond the tutorials.

Gineesh Madapparambath
Gineesh Madapparambath is the founder of techbeatly. He is the co-author of The Kubernetes Bible, Second Edition and the author of Ansible for Real Life Automation. He has worked as a Systems Engineer, Automation Specialist, and content author. His primary focus is on AI, Ansible Automation, Containerization (OpenShift & Kubernetes), and Infrastructure as Code (Terraform). (Read more: gineesh.com)
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