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CodexBeginnerFree

Introduction to OpenAI Codex

Learn to drive OpenAI's coding agent: real tasks, safe sandboxing, and terminal-to-cloud workflows that ship.

12 lessons1h 47m read totalTaught by Pramod DuttaLifetime accessVerified certificate

About

OpenAI Codex turns a frontier model into a hands-on coding agent that reads your repo, edits files, and runs your tests. This free course takes you from installation to real engineering workflows: bug fixes, multi-file refactors, verification loops, and automated code review. No prior experience with AI coding agents required.

You will learn to

  • ✓ Explain what an agentic coding tool actually does and how Codex differs from autocomplete assistants
  • ✓ Install, authenticate, and configure the Codex CLI, then complete your first real task with it
  • ✓ Steer Codex with AGENTS.md files, focused context, and precise four-part task prompts
  • ✓ Run safe multi-file refactors backed by testing and verification loops
  • ✓ Control the blast radius with sandboxing, approval modes, and git-based recovery
  • ✓ Pick the right surface (CLI, IDE extension, or cloud) for bugfixes, features, and code review

How you'll learn

12
interactive chapters

Read at your pace: diagrams, copy-paste prompts, worked steps.

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Curriculum

01Chapters12 lessons
  • 1. From Autocomplete to Agents: What Codex Is▶ Free preview11 min read
  • 2. Installing Codex and Signing In9 min read
  • 3. Your First Task: A Guided Walkthrough10 min read
  • 4. How Codex Reads Your Codebase: Context and AGENTS.md10 min read
  • 5. Prompting Codex Effectively9 min read
  • 6. Multi-File Changes and Refactors10 min read
  • 7. Testing and Verification Loops9 min read
  • 8. Sandboxing, Approvals, and Staying Safe11 min read
  • 9. One Agent, Three Surfaces: CLI, IDE, and Cloud9 min read
  • 10. Real Workflows: Bugfix, Feature, and Code Review10 min read
  • 11. Wrap-Up: Habits, Pitfalls, and Where to Go Next9 min read
  • 12. Knowledge Check5 min