Mastering LLMs is a free course featuring over 25 industry veterans covering topics such as evaluation, retrieval-augmented generation (RAG), and fine-tuning. The course content is provided by experts in fields like information retrieval, machine learning, recommendation systems, MLOps, and data science, aimed at applying previous techniques in these domains to LLMs, offering meaningful advantages to users. The course is designed for technical ICs, including engineers and data scientists, who need guidance on improving AI products.