Complete Beginner's Guide to OpenAI’s Codex App
I spent real time learning OpenAI's Codex app from scratch, and some of it genuinely surprised me.
This is the full walkthrough for beginners
⏱️ TIMESTAMPS
0:00 - Why I'm covering Codex (not just Claude Code)
0:30 - What is Codex App + 4 ways to use it
2:00 - Three execution modes: local, cloud, worktrees
5:00 - The project sidebar (the killer feature)
7:00 - Key shortcuts you need to know
9:00 - Models and reasoning levels
12:00 - Prompting: the 4 pillars
15:00 - Customization: agents.md, skills, MCPs
18:00 - Sub-agents and parallel work
19:30 - IDE vs Terminal (honest take)
21:00 - Safety, sandboxing, and hooks
22:30 - Power user features (automations, code review, git)
27:00 - Best practices and common mistakes
32:00 - What's next
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