Free AI Course – Learn Artificial Intelligence Online

Artificial intelligence is reshaping every industry — and you don't need an expensive degree or paid course to break in. Back Propagation offers a completely free AI course that takes you from fundamentals to building real AI applications, at your own pace, with no paywalls.

Why learn AI in 2025?

AI engineering has become one of the fastest-growing roles in tech. Companies large and small are hiring people who can work with language models, build intelligent pipelines, and ship AI features. The barrier to entry has never been lower — the tools are open source, the best educational material is free, and the community is active. The main thing you need is a clear learning path.

What this free AI course covers

• →AI fundamentals: What machine learning is, how neural networks work, and the maths you actually need.
• →Hands-on deep learning: Build and train models in PyTorch. Understand CNNs, RNNs, and transformers from the inside.
• →Large language models: Understand how LLMs like GPT work, how to fine-tune them, and how to use them via APIs.
• →Building AI applications: RAG systems, chatbots, code assistants, and AI agents that use tools.
• →Real projects: Build things you can show employers. Portfolio-worthy projects at each stage of the course.

How the AI course online experience works

Start the AI Engineer Roadmap and work through it topic by topic. Each topic comes with the best free resource for that subject — we've filtered out the noise so you don't have to. Check items off as you complete them and star the ones you want to revisit. Your progress is saved so you can pick up exactly where you left off.

As you get further along, start preparing for roles with the AI/ML interview question bank and checking the live job listings. You can also explore the resources library for deeper dives into any area that interests you.