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course Published on 5 October 2026

Codex: 18 essential concepts — from zero to an assistant that works for you

A course with four learning paths and 18 modules explains essential Codex concepts, with illustrations in each topic.

The course “Codex: os 18 conceitos essenciais” introduces Codex as an assistant that can work with files in a folder, follow defined rules, and run tasks at scheduled times. Across four tracks and 18 short modules, it explains everything from projects and instructions to models, permissions, the browser, and voice mode. Each topic includes illustrations, everyday examples, and ready-to-use prompts.

For people who already chat with AI tools in a browser, the course shows how to organize work so Codex can consult files and instructions before responding. It also explains how to choose how much the assistant can do on its own and how to reuse recipes for recurring tasks. The aim is to bring projects, rules, and tools into one workflow instead of starting the explanation over in every conversation.

The course is for people who have never opened Codex and does not require programming knowledge. Lessons use the desktop app; the terminal is presented as an alternative, with a few commands explained. To follow along, you need a ChatGPT subscription, the Codex app, and a work folder based on something real from everyday life. Progress and notes are saved in the browser.

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