txt Mastering ChatGPT: Understand the Technology, Master Prompting, Automate Workflows

Stop using ChatGPT like a smarter search box. Learn how to turn it into a practical tool for thinking, writing, research, analysis, coding, automation, and real work.

ChatGPT can draft an email in seconds. That is the easy part.

Used well, it can analyze documents and spreadsheets, help plan projects, work with images and PDFs, write and review code, connect to outside tools, carry out multi-step assignments, and become part of automated workflows. Used carelessly, it can also produce confident mistakes, expose sensitive information, waste money, or automate the wrong thing faster than you could have done it manually.

Mastering ChatGPT shows you how to use the technology deliberately—from the fundamentals of language models to advanced workflows with prompting, Projects, Memory, Skills, Custom GPTs, Codex, agents, MCP, RAG, evals, and the OpenAI API.

You will learn not just what ChatGPT can do, but how to get better results, recognize failures, verify important claims, manage risk, and decide when AI should—and should not—act on your behalf.

This book is for anyone who wants to move beyond casual AI use:

• beginners who want to understand what ChatGPT and large language models actually do
• professionals who want to write, research, analyze, plan, and automate more effectively
• managers and business leaders who need practical guidance on AI adoption, ROI, governance, privacy, and human oversight
• developers who want to work with Codex, tool use, MCP, RAG, agents, Structured Outputs, evals, and the OpenAI API

Inside, you will learn how to:

• understand tokens, context windows, embeddings, reasoning, hallucinations, and model limits without needing a computer science degree
• write prompts that provide the right context, goals, examples, constraints, and output format
• use ChatGPT with documents, images, PDFs, spreadsheets, Projects, Memory, Skills, and Custom GPTs
• work with Codex for real programming tasks and structured development workflows
• understand agents, tool use, Computer Use, MCP, and connected apps—and where human approval still belongs
• build reliable API workflows with streaming, batch processing, prompt caching, structured data, files, and semantic search
• evaluate AI systems with golden sets, regression tests, observability, and human review
• defend against prompt injection, unsafe agent behavior, data leakage, and overly broad permissions
• make better decisions about privacy, retention, governance, compliance, and responsible deployment
• measure whether AI is actually saving time and creating value instead of merely producing more output

This is not a book of magic prompts.

It is a practical guide to understanding the system well enough to use it with judgment. You get clear explanations, hands-on exercises, reusable prompt patterns, case studies, warnings, decision frameworks, a glossary, a cheat sheet, and a full index designed to make the book useful both as a course and as a desk reference.

The goal is not to trust ChatGPT more. The goal is to know when to trust it, when to verify it, when to constrain it, and when not to use it at all.

Whether you are opening ChatGPT for the first time or building production workflows with the OpenAI API, Mastering ChatGPT gives you the foundation and practical tools to move from experimentation to deliberate, productive use.

About this U.S. edition: This edition is written specifically for American readers. Its examples, workplace scenarios, privacy discussions, legal context, and case studies are localized for the United States, including U.S. federal, state, and sector-specific considerations. The German-language edition uses European examples and addresses European legal and regulatory conditions instead.