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Chapter 1 · LLM Fundamentals

What Is an LLM? Free Lessons for Beginners

Meet the model: what it does well and where it stumbles.

  1. Lesson 1

    What Is a Large Language Model (LLM)?

    A beginner-friendly explanation of large language models: how LLMs learn to predict the next piece of text and why they are not a database of facts.

  2. Lesson 2

    What Can LLMs Do? Everyday AI Use Cases

    See what large language models are great at: summarizing, rewriting, brainstorming, translating, and explaining — plus a simple rule for when to use AI.

  3. Lesson 3

    LLM Limitations and Knowledge Cutoff Explained

    Why AI can sound confident and still be wrong. Learn about knowledge cutoff, math and counting mistakes, and when to double-check an LLM.

  4. Lesson 4

    AI Model vs. Chatbot App: What's the Difference?

    The model and the chat app are not the same thing. Learn how chatbots wrap a language model and what really happens when AI 'searches the web'.

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