fast.ai is a leading non-profit platform in 2026 for democratizing deep learning, offering free practical courses like Practical Deep Learning for Coders, the fastai PyTorch library, and tools such as nbdev. It emphasizes top-down, code-first learning for real-world applications, with community support and updates including Stable Diffusion implementations. Ideal for coders wanting hands-on deep learning skills without heavy math prerequisites—completely free with strong focus on accessibility and ethics.