Understand AI, one quiet night at a time.

Yes. All 42 lessons, quizzes, interactive explainers and learning tracks are free, with no sign-up, no paywall and no ads. Your progress is saved in your own browser.

Anyone curious about artificial intelligence. The Beginner level assumes nothing, the Intermediate level covers how machine learning and neural networks work, and the Advanced level explains large language models, transformers, fine-tuning, agents and alignment. Tracks pick lessons for a goal, like using AI at work.

No. Beginner lessons use plain English and pictures. Later lessons add light maths and optional Python examples that run right in your browser, so there is nothing to install.

Each lesson takes about five to ten minutes. The whole course is roughly 4 hours of reading, which most people spread over a few weeks of short evening sessions.

What AI is and isn't, how machines learn from data, neural networks and backpropagation, how ChatGPT-style chatbots and large language models work, prompting, embeddings, transformers and attention, retrieval-augmented generation (RAG), fine-tuning, AI agents, image generation with diffusion, and AI safety.

Every lesson is an original, plain-English summary that credits and links to the free and open material it builds on, including Stanford courses, Google's Machine Learning Crash Course, fast.ai, Hugging Face, 3Blue1Brown and Andrej Karpathy.

There is no formal certificate. Each level ends with a final check and a card you can share. If you need a certificate, Elements of AI from the University of Helsinki and Kaggle Learn offer free ones; our free AI courses guide lists them.

Yes. AI in Bed is built for phones: lessons are swipeable cards and can be read aloud. You can install it on your home screen and save a whole level or track to read with no signal.