Part 4 · From understanding to doing

What can AI actually do for you?

You know how it works — now the practical part. Here's how you actually use tools like ChatGPT, Claude and Gemini, the huge range of things they're good for, what's free versus paid, and exactly where a human still has to step in.

Chat · Copilot · API Real use cases Free vs paid A worked build

First, a key distinction

1Three ways you actually use these tools

ChatGPT, Claude and Gemini are products; the LLM is the engine inside. You can reach that engine three ways — and the cost and skill needed are very different. Pick one.

The chat app

You type a question or task into a chat window, and it replies. The simplest way in — no setup, no coding.

Who it's for

Anyone. If you can send a message, you can use it.

What it costs

A free tier, or around $20/month for higher limits and better models.

Example

Asking it to draft an email, summarise a report, or explain a tricky topic.

In short

The websites and apps most people mean when they say “ChatGPT”.

Same engine, different doors: the model behind the chat app is the same kind of model a developer calls through the API. What changes is how you reach it, and how you pay.

The range

2What can you actually use it for?

Far more than chatting. Filter by the kind of work, and tap any card for a concrete example. Each one shows whether it's free-friendly and how much you need to stay involved.

A pattern you'll notice: AI is strongest at first drafts and heavy lifting. The more a task involves facts, money or judgement, the more you stay in the loop to check and decide.

The money question

3What's free, and what's paid?

AI pricing comes in a few clear shapes. Pick a tier to see what it gives you and who it suits — and don't miss the part most people forget: the AI is often the cheapest piece of the puzzle.

Exact prices and plan names change often. These are the shapes, not a live price list. As of mid-2026, the standard paid tier sits around $20/month across ChatGPT, Claude and Gemini — always check each provider for current rates.

Free tier

Use the chat apps at no cost, with limits on how much and how fast.

What you get

A capable model with caps on messages, speed and context length; usually a smaller free model.

Best for

Trying it out, light personal use, and learning the ropes.

When you build something real, the AI is often the cheapest part. Budget for hosting, a domain, a database and any third-party services — those usually add up to more than the model itself.

A worked example

4Building a simple website, step by step

Here's where AI helps and where you take over — using a real project. Tap each step to see what AI can do, what you still own, the cost, and the split between the two.

Plan & decide

Free

✦ AI can do

Brainstorm the structure, suggest pages and draft a sitemap.

⌖ You do

Decide what the site is actually for and what success looks like.

Who does the work here

AI 50%

You 50%

Where: any chat app — just talk it through.

Notice the correction to a common myth: modern AI can draft both the frontend and a lot of the backend. But you still decide the architecture, review and test the code, create the accounts, buy the domain, deploy it, and answer for whether it's safe and correct.

The dividing line

Where a human is always needed

A simple way to split the work: let AI handle the language and the heavy lifting, and keep the judgement, the checking and the real-world actions for yourself.

✦AI handles well

Generating and transforming language and ideas you give it.

First drafts of emails, docs, posts and code
Summarising, explaining and rewriting
Brainstorming options and exploring ideas
Translating and reformatting content
Speeding up repetitive, low-risk work

⌖You always own

Anything needing judgement, truth, or real-world consequences.

The final decision — and being accountable for it
Checking facts, numbers and sources
Anything with money, legal or medical stakes
Sensitive or confidential data
Creating accounts, buying things and deploying to the real world

This is the same thread running through the whole suite: AI predicts and produces; you verify and decide. It's a powerful assistant, not a replacement for your judgement.

The mindset that gets real value from AI: it does the heavy lifting, you do the deciding and the shipping

Start free, use it for first drafts and grunt work, and stay in charge of the parts that matter.

◷

Start free, upgrade when it paysOnly move to a paid tier once the free limits genuinely slow you down.

✦

Let it draft, then you refineTreat every output as a strong first draft to check and improve.

⌖

Keep the last mile humanDecisions, accounts, payments and shipping stay with you.