Llama 3, developed by Meta, is a family of large language models (LLMs) that excel in language modeling, question answering, code generation, and mathematical reasoning, surpassing competing models like Google’s Gemini and Anthropic’s Claude 3. This article explores the fine-tuning of Llama 3 using Low-Rank Adaptation (LoRA) to efficiently modify the model’s parameters without extensive computational resources, making it feasible to fine-tune on Google's Colab. Llama 3's architecture employs a decoder-only transformer with Grouped-query Attention (GQA) to optimize parameter count and maintaining performance. The tutorial guides through fine-tuning the Llama 3 8B model for a customer service application using techniques like quantization and instruction-based fine-tuning with explanations, demonstrating significant improvements in accuracy compared to the base model. The approach highlights the potential of achieving production-ready performance without large GPUs, emphasizing the benefits of efficient resource utilization and reduced training costs.