Don’t Fine-Tune That Model Yet: What I Wish I Knew Before Starting with LLMs
Last Updated on August 29, 2025 by Editorial Team
Author(s): Prisca Ekhaeyemhe
Originally published on Towards AI.
A practical guide to choosing between prompting, RAG, and fine-tuning from someone who learned the hard way.
This year, I’ve spent a lot of time learning about Large Language Models (LLMs) and building applications powered by them. Like many people diving into this space, I was excited to apply what I’d learned, especially about Retrieval-Augmented Generation (RAG). My first instinct? Build a sophisticated RAG-powered app. Non-members can read it here.

The article shares insights gained from testing and learning about Large Language Models (LLMs), focusing on the importance of simplicity and practicality in approach. It emphasizes three techniques: Prompt Engineering, Retrieval-Augmented Generation (RAG), and Fine-Tuning, discussing their pros and cons, and when to use each. The author reflects on their own journey, advocating for starting with the simplest methods before resorting to more complex strategies, allowing the specific business problem to dictate the solution.
Read the full blog for free on Medium.
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