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OpenAI Codex Complete Tutorial

Overview

This is a complete guide to OpenAI Codex, covering everything from the basics to the advanced workflows that actually make a difference in real projects.

We build up step by step, so you can follow along from the start or skip ahead to whatever you're stuck on. By the end, you'll have a clear picture of how to fit Codex into your day-to-day development workflow.

Deployed Application: https://linkforge-psi.vercel.app/

Project Repository: https://github.com/telusko-aliens/LinkForge.git

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Master Java Spring Development : https://go.telusko.com/learn-master

Coupon: TELUSKO10 (10% Discount)

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00:00:00 - Introduction

00:00:19 - What is Codex ?

00:06:49 - Codex Vs Claude Code

00:10:00 - Pricing & Usage Limits

00:15:05 - Codex App

00:33:57 - Codex on the Web

00:36:32 - Intro to Codex CLI

00:55:25 - / Slash Commands

01:01:59 - Codex in Headless Mode

01:06:39 - Git and GitHub

01:17:05 - What is AGENTS.md ?

01:22:15 - Understanding Sub-Agents

01:39:24 - How Skills Work

01:48:43 - Introduction to MCP Server

02:00:49 - Git Worktree Explained

02:17:35 - Integrating Database

02:22:40 - Deployment

Chapters 17

  1. 00:00:00Introduction
  2. 00:00:19What is Codex ?
  3. 00:06:49Codex Vs Claude Code
  4. 00:10:00Pricing & Usage Limits
  5. 00:15:05Codex App
  6. 00:33:57Codex on the Web
  7. 00:36:32Intro to Codex CLI
  8. 00:55:25/ Slash Commands
  9. 01:01:59Codex in Headless Mode
  10. 01:06:39Git and GitHub
  11. 01:17:05What is AGENTS.md ?
  12. 01:22:15Understanding Sub-Agents
  13. 01:39:24How Skills Work
  14. 01:48:43Introduction to MCP Server
  15. 02:00:49Git Worktree Explained
  16. 02:17:35Integrating Database
  17. 02:22:40Deployment

Advantages and disadvantages

Advantages

  • Free, one long video that covers a topic end to end.
  • Use the chapters to jump to what you need.
  • Taught in Hindi (or Hinglish), which many students find easier to follow.
  • Made for Indian students, with placement and exam context.
  • Completely free.
  • Self-paced: start any time.
  • A clear syllabus (17 parts) you can see before you start.
  • Start watching right away, no sign-up.

Disadvantages

  • No exercises or certificate: code along to make it stick.
  • Less depth than a university course on some topics.
  • No certificate.
  • No graded assignments or feedback.

Some points apply to every course of this kind; see how we rank.

Free

  • Free: Watch on YouTube, no account needed.
  • Certificate: None. Code or take notes along to make it stick.

Telusko is in Tier 3: good universities, respected companies, nonprofits and well-known teachers of our institution ranking (72/100).

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