# Where the book teaches this (/from-skills-to-income/where-the-book-teaches-this)

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type: Document
title: "Where the book teaches this"
description: "Which parts of the book teach each skill a product needs, and why selling through AI apps lowers the cost of a first customer."
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    at: 2026-11-05T15:45:50Z
chapter: "F4"
part: Front
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last_verified: 2026-10-29
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  at: 2026-11-05T15:45:50Z
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- **Part I and Part II** teach what an AI Worker is and how to manage one. That is the expertise your customers and employers will pay for.
- **Part III** teaches the build: skills, plugins and connectors, the server behind them, and hosted agents, on Anthropic, OpenAI and open-source platforms.
- **Part VI** teaches the business: choosing your vertical, pricing, getting paid, charging for access to your server, and publishing to the Claude and OpenAI directories.
- **Parts V and VII** take this to the scale of companies and countries, where the challenge becomes return on investment and the capacity to produce and export AI work.

## Why this matters

This model removes some of the costs that used to come before the first customer. You do not have to build and host a separate application for the interface, and where the customer's plan runs the AI, you receive no bill for its reasoning.

What remains is a modest server, your material, and the work of finding customers. That puts a product within reach of a training firm or a small consultancy anywhere in the world, and a country whose people can do this can export AI work, not only import it.

**Start with a problem someone will pay to solve. Show useful results on a small scale, and earn the customer's trust before you grow. Whichever route you take, that is how skills become income.**

[Part 0. How AI Works](../how-ai-works/overview.md) comes next.