Codex: From Beginner to Expert in 15 Minutes

In this beginner-friendly Codex tutorial, I break down what OpenAI Codex is, why I think it is one of the best AI coding harnesses available today, and how to start using it like a power user. This walkthrough covers the basics of getting Codex installed, choosing the right model and reasoning settings, working with projects and files, using plugins, creating artifacts, running automations, and giving Codex access to your computer through Computer Use. Chapters: 0:18 - Create a ChatGPT Account and Install Codex 0:52 - What a Coding Harness Is 1:13 - Choosing Models, Reasoning, and Usage Settings 2:12 - Plan Mode, Goal Mode, and Files 3:09 - Plugins and Skills Explained 4:43 - Automations in Codex 5:25 - Projects, Chats, and Full Access 6:00 - Working Inside a Project Folder 6:42 - Creating an Artifact Document With Codex 7:57 - Coding vs Everyday Work Settings 8:36 - Reviewing Artifacts and Generated Files 9:24 - Why HTML Files Are Useful Outputs 9:53 - Computer Use Plugin Overview 12:17 - How Computer Use Controls Your Browser 13:27 - Creating a Daily AI News Automation 14:34 - What Beginners Should Build First Topics covered: What OpenAI Codex is How Codex compares to ChatGPT How to install and set up Codex How to choose GPT-5.5 and reasoning settings How Plan Mode and Goal Mode work How plugins and skills make Codex more capable How to use Codex with local folders and files How to create HTML artifacts and strategy documents How Computer Use lets Codex operate Chrome and Gmail How to create recurring Codex automations Tools mentioned: OpenAI Codex ChatGPT Computer Use Gmail Vercel Codex Security Test Android Apps If you are just getting started with AI coding agents, this is a practical overview of how to use Codex for real work: building websites, working with files, deploying projects, automating research, and controlling apps on your computer. #Codex #OpenAICodex #AICoding #AIAgents