ai-by-hand-excel is a resource repository that facilitates hands-on practice of AI technology using Excel. It provides a series of Excel files that allow users to manually execute and understand key operations of AI models, such as Softmax, LeakyReLU, Backpropagation, and Transformers. This repository is suitable for beginners and educators looking to gain a deeper understanding of the internal mechanisms of AI models, helping them enhance their grasp of AI technology through practical operation.