Free Codex Tutorial for Product Managers

Learn Codex IN Codex!

This course is taught entirely inside Codex itself 😈

• You’ll download the Codex app and the course files, then start the first lesson — and Codex becomes your instructor
• It guides you through each module interactively, right in the Codex app
• You learn by doing real PM work with real files

Who This Course Is For

Product Managers who want the most powerful way to put AI to work — not as a chat window you copy-paste into, but as an agent that actually does the work alongside you.

OpenAI Codex isn’t just for engineers. For PMs it’s an AI workspace that:

• Reads your research, drafts and edits PRDs, and analyzes data across many files
• Runs multi-step tasks and even works in parallel on batches of work
• Remembers context about your product through a project file (AGENTS.md)
• Acts as custom reviewers (engineer, exec, UX) before you share work with your team

You don’t need coding or terminal experience. If you can describe what you want in plain English, you can use Codex.

What You’ll Learn

Module 1: Fundamentals (~3 hours)

• File operations: Read, transform, and create documents with file references
• Visual workspace: Set up a split-screen workflow to see files as Codex works
• Parallel agents: Launch multiple Codex instances to process files simultaneously
• Custom sub-agents: Create permanent AI advisors with different perspectives
• Project memory: Use AGENTS.md so Codex remembers your product context
• Commands & shortcuts: Slash commands, keyboard shortcuts, power user features

Module 2: Advanced PM Work (~2 hours)

• Write a PRD: Partner with Codex to write better PRDs faster with multi-perspective review
• Analyze data: Funnel analysis, impact estimation, and A/B test readouts
• Product strategy: Make hard strategic calls and build executive-ready slides

Module 3: Vibe Coding (~1-2 hours)

• Setup & mindset: The vibe coding approach — you describe, Codex builds
• Planning: Interview process to define clear requirements before building
• Build & iterate: Scaffold your app and refine it with screenshots
• Version control: Back up your work with GitHub
• Go live: Deploy to Vercel with a real URL anyone can visit

How It Works

1. Get the Codex app — a free download; sign in with your ChatGPT account
2. Download course materials — Includes practice files and lesson scripts
3. Type /start 1 1 — Codex begins teaching you interactively
4. Learn by doing — Every concept includes hands-on practice

These reference pages provide deeper explanations and quick lookups while you work through the interactive lessons.

Prerequisites

• A ChatGPT account — Plus ($20/mo) is recommended. See Codex pricing
• Mac, Windows, or Linux computer
• ~3 hours for Module 1

No coding experience required. If you can have a conversation and work with documents, you can use Codex.

Get Started

👉 Setup Guide — Get the Codex app in ~5 minutes

👉 Start the Course — Open the files and begin

Use the sidebar to browse all modules. The search page lets you find specific topics quickly.

About This Course

Created by Carl Vellotti.

• Have feedback about the course? Message me — I’d love to hear it.
• I write a newsletter and run a community for PMs building with AI. Check out The Full Stack PM.

Source Repository: github.com/carlvellotti/codex-pm-course

Disclaimer

This course and its creator are not affiliated with, endorsed by, or sponsored by OpenAI. Codex is a product of OpenAI. I’m an independent creator who loves Codex and wants to help other Product Managers learn to use it effectively.