The source announces that Hugging Face has released a free, 200-page open textbook on deep learning. This comprehensive resource is designed to educate users on building and training neural networks from scratch. The guide is written accessibly, covering the entire training process, including the necessary mathematics, data preparation, and model optimization techniques. This release aligns with Hugging Face's goal of promoting open AI education and transparency within an industry often characterized by proprietary systems. Ultimately, the textbook aims to democratize access to understanding how modern AI models function for beginners and experienced users alike.