
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.
Join thousands of data leaders on the AI newsletter. Join over 80,000 subscribers and keep up to date with the latest developments in AI. From research to projects and ideas. If you are building an AI startup, an AI-related product, or a service, we invite you to consider becoming a sponsor.
Published via Towards AI
Take our 90+ lesson From Beginner to Advanced LLM Developer Certification: From choosing a project to deploying a working product this is the most comprehensive and practical LLM course out there!
Towards AI has published Building LLMs for Production—our 470+ page guide to mastering LLMs with practical projects and expert insights!

Discover Your Dream AI Career at Towards AI Jobs
Towards AI has built a jobs board tailored specifically to Machine Learning and Data Science Jobs and Skills. Our software searches for live AI jobs each hour, labels and categorises them and makes them easily searchable. Explore over 40,000 live jobs today with Towards AI Jobs!
Note: Content contains the views of the contributing authors and not Towards AI.