What Is an AI Assistant?

AI assistants such as ChatGPT, Claude and Gemini can draft an email in seconds, explain a confusing letter, summarise a long report or help you plan a trip. Used well, they save hours. Used carelessly, they can also give you wrong information that sounds completely right.

This course teaches you to use them well. No technical knowledge needed: if you can type a message, you can follow along. Have an assistant open in another tab as you read, and try the prompts yourself.

How an assistant produces an answer

An AI assistant is a chat app built on a large language model (LLM). The model was trained on a huge amount of text: books, websites, articles and more. From all that reading, it learned the patterns of language, and a great deal about the world.

When you send a message, the model doesn't look the answer up. It writes an answer, a few letters at a time, each time predicting what's most likely to come next given your message and everything written so far.

This explains both their magic and their main weakness:

• They're fluent: they can write in any style, explain at any level, and handle almost any topic.
• They can be confidently wrong: if the most likely-sounding answer isn't true, the assistant may write it anyway. This is called a hallucination, and you'll learn to catch them on Day 6.

What they're good at, and where to be careful

A good rule: use AI to help you think and write faster, not to replace your judgement. You stay responsible for what you send, publish or decide.

Choosing an assistant

The main general assistants all do the everyday jobs in this course well:

Each has a free plan that's enough to follow this course. Paid plans usually add more powerful models, higher usage limits and extra features. The buttons and menu names differ between apps and change often, so this course focuses on the skills, which work in all of them.

Your first conversation

Open an assistant and try this:

I'm going to a job interview next week for a receptionist role at a dental practice. What questions are they likely to ask me?

Now, instead of starting again, reply in the same chat to shape the answer:

Thanks. Pick the 3 most important ones and give me a short, natural example answer for each. I've worked in a busy café for two years.

The assistant remembers the conversation so far, so short follow-ups like "shorter", "more formal", "give me 3 more" or "explain number 2" are the quickest way to a good result. Think of it as a conversation with a helpful (but sometimes overconfident) assistant, not a search box.

Recap

• AI assistants are chat apps built on large language models that write answers by predicting likely text.
• They're excellent with language: drafting, rewriting, summarising, explaining and brainstorming.
• They can be confidently wrong, so check facts, numbers and anything important.
• ChatGPT, Claude, Gemini and Copilot all handle everyday tasks well; the skills in this course work in all of them.
• Use follow-up messages in the same chat to improve answers, and a new chat for a new topic.

Tomorrow you'll learn the five ingredients of a good prompt.