Your first useful result with AI.

The Book of 42 · free guide

A free foundation guide: 42 short lessons in seven parts. It helps you get a first useful result, teaches you to brief, check and improve, and points you to the guide that fits your work.

One email with the book. No spam.

THE BOOK OFYour first useful results with AIFREE FOUNDATION GUIDE THE BOOK OFYour first useful results with AIFREE FOUNDATION GUIDE

Tell it what it cannot see

The assistant knows a great deal about the world and nothing about your situation. Context is the part only you can supply.

A vague ask

“Write a message to a customer about a late order.”

A clear brief
  • Write a WhatsApp message to a customer whose steel lunchbox is four days late because the courier missed two pickups. She has already written to us once and got no reply. I want her to feel looked after and to know the new delivery date, which is Thursday. Under 60 words, warm, no excuses.

Illustrative lesson. Final content may change.

42 short lessons, in order.

Seven parts, from your first useful result to your own toolkit.

  1. Start using AILessons 1 to 6 · A useful task, basic limits, privacy, checking
  2. Give a useful briefLessons 7 to 12 · Goal, context, inputs, constraints, examples, format
  3. Improve the responseLessons 13 to 18 · Clarification, iteration, diagnosis, verification
  4. Apply itLessons 19 to 24 · Understand, write, analyse, create, plan, practise
  5. Adapt itLessons 25 to 30 · Your work or your personal goals
  6. Build reusable workflowsLessons 31 to 36 · Repeatable steps and appropriate human review
  7. Assemble your toolkitLessons 37 to 42 · A personal toolkit and a next step

How a lesson works.

Ten minutes each, in the AI assistant you already use.

  1. Read one ideaEach lesson makes one point.
  2. See it go wrongA vague ask, and what it gets back.
  3. See it fixedThe same ask, written clearly.
  4. Try it yourselfOn something you need this week.

Who made it.

Ridhi Karan

Ridhi Karan

Founder, 42 Prompts

2 Billion+ad impressions on Meta, selling physical products
A prompt without the inputs, a worked answer and the checks is half a tool. I wanted the whole tool on one page.

Every guide starts from the jobs people in a field actually do, keeps the ones where AI genuinely helps, and shows its working on the page: the inputs, the prompt, a worked answer and what to check.

  • Has advised multiple e-commerce ventures since

Before you sign up.

Is it really free?

Yes. Leave your email and the book is sent to you. There is nothing to pay.

What will you send me?

One email with the book. We only write again if you ask us to.

Do I need a paid AI plan?

No. The lessons use plain text prompts in the assistant you already use.

How is this different from the paid guides?

The book teaches the method. Each paid guide gives you 42 finished workflows for one kind of work.

Start with lesson one.

One email with the book. No spam.