Build an LLM Application (from Scratch) is a practical and comprehensive handbook for creating custom LLM applications without relying on premade frameworks. You'll start by mastering the fundamentals of search systems and RAG. Then you'll apply this knowledge to real-world projects, including building a hotel search engine using TripAdvisor review data, implementing semantic caching in RAG production systems, and deploying a full RAG application using Hugging Face and Gradio. By the end of the book, you'll have the skills to build AI agents from scratch, deploy open source LLMs with advanced quantization techniques, and create innovative, specialized LLM applications designed for your specific needs.