Module 0: Getting Started0.1: Introduction

Module 0.1: Introduction to Codex for PMs

Reference Guide

  • Time to Complete: 10 minutes
  • Prerequisites: None

📖 Overview

Codex is OpenAI’s AI agent — an app on your computer that does real work with your files when you ask it in plain English. It reads documents, writes and edits them, analyzes data, and runs multi-step tasks for you.

You don’t need to be an engineer to use it. If you can describe what you want, Codex can do it.

This course is taught entirely inside the Codex app. You’ll download the app, download the course files, and Codex itself becomes your instructor — guiding you through each lesson interactively, right where you’ll be doing the work.

Key takeaway: Codex saves PMs hours every week by automating document creation, research synthesis, meeting-note processing, data analysis, and the repetitive parts of product work.

Who This Course Is For

Perfect for:

  • Product Managers at any level
  • PMs new to AI tools, or moving beyond the ChatGPT web app
  • Product-adjacent folks (PMMs, designers, ops) who live in docs and data

Not ideal for:

  • Engineers (you already know Codex)
  • People looking for a pure coding tutorial

No coding experience required. Everything happens in a friendly desktop app — no terminal, no commands to memorize.

What Codex Is

Codex shows up in a few places — this course uses the first one:

SurfaceWhat it is
Codex appThe desktop app for Mac and Windows. This is where the course happens.
IDE extensionCodex inside VS Code, Cursor, and Windsurf — for engineers.
Cloud / WebRuns tasks in the cloud at chatgpt.com/codex.
CLIA terminal version for developers. You won’t need it.

What makes Codex different from a chat window:

  • It works with your real files — no copy-pasting in and out of a chatbot.
  • It takes action — creates, edits, and organizes documents and runs multi-step tasks.
  • It remembers your context — through a project file called AGENTS.md.
  • It’s reviewable — Codex shows everything it does, and changes can be rolled back.

Real-World PM Use Cases

Strategy & research

  • Draft PRDs from messy notes or research
  • Synthesize interview transcripts and survey responses into insights
  • Structure competitive research into comparison matrices

Execution

  • Turn a PRD into a list of user stories / tickets
  • Clean, reshape, and analyze CSVs and spreadsheets
  • Batch-organize files and documentation

Communication

  • Generate stakeholder updates and release notes from source material
  • Build presentation outlines and speaker notes

How This Course Works

The course has two parts:

  1. Interactive lessons (the main event) — You run a lesson inside the Codex app and it teaches you step by step while you do real work. You learn by doing, not by watching videos.
  2. Reference guides (these pages) — Clean written docs you can search and refer back to anytime.

Every exercise uses TaskFlow, a fictional project-management SaaS (think “Asana meets Jira”). You’ll step into the role of Senior PM for activation & onboarding with realistic PRDs, research, personas, and data already set up for you.

What You’ll Learn

  • Module 1 — Fundamentals: Get comfortable working with Codex — files, context, and the core moves that make it useful for PM work.
  • Module 2 — Advanced PM Work: Apply it to the real thing — writing PRDs, analyzing product data, and developing strategy.
  • Module 3 — Vibe Coding: Go from idea to a working prototype you can click through — no engineering required.

Requirements

  • Mac or Windows computer
  • A ChatGPT account (a free tier exists; Plus at $20/mo is recommended for comfortable daily use)
  • Basic PM experience (you know what a PRD is)
  • A few hours, and a willingness to learn by doing

🚀 What’s Next?

Module 0.1 complete — you know what Codex is and how the course works.

Next: Module 0.2 — Get the Codex App. You’ll download the app, sign in with your ChatGPT account, and get ready to run your first lesson.

Go to Module 0.2: Get the Codex App →

📚 Resources

Home0.2: Get the Codex App