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🤖 Ultimate Codex Tutorial for Beginners in 2026 (Full Course)

Step into Codex 2026 with this full beginner-friendly tutorial. Follow each step to write smarter code, automate tasks, and build real projects faster, no experience needed.

Author

Robin Do
June 11, 2026

TL;DR

ChatGPT Codex works best when you use it as a full workflow, not a place for one-off coding prompts. The better approach is to set it up, organize your projects, create reusable skills, connect the right tools, and review its work carefully.

This guide shows you how to use Codex from the basics: what it is, how to set permissions, how to choose models, and how to run your first safe task. You’ll also learn how to use projects, plugins, automations, memory, and outside tools like Claude, Gemini, Lovable, and GitHub.

Key points

  • One important fact: Start with the lowest plan, then upgrade only when limits block real work.

  • One common mistake to avoid: Do not give full access too early.

  • One practical takeaway: Build one project and one reusable skill first.

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Introduction

I know you've seen it. Your feed, my feed, everyone going crazy comparing Claude Code vs ChatGPT Codex. Creators are going viral off it, devs are picking sides, and honestly? The hype is real.

But I kept noticing that nobody's actually sitting down and showing beginners how to use Codex. Like, from zero.

Now, last time I gave you a full course on Claude Code, and you guys loved it. So this time, I thought: let's do the other side. Let's go deep on Codex.

I'm going to walk you through everything, and I mean everything you need to get started with Codex in 2026. You'll actually be able to use it. 🚀

I. What Codex Actually Is

ChatGPT Codex is an agentic coding app.

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