Codex Zero to Hero
Module 08: Codex for Reading and Understanding Codebases
A practical module for moving from concept to safe Codex execution.
Learning Outcomes
- Explain the topic in beginner-friendly language.
- Prompt Codex with context, constraints, and done-when criteria.
- Review output safely before publishing.
Safety Note
Use branches, backups, previews, and human review. Do not deploy untested code or commit secrets.
Module progress
0/7 lessons complete – 0% complete
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Lessons
Ask Codex to Inspect Before Editing
By the end, learners can explain ask codex to inspect before editing, ask Codex for focused help, review the result, and decide the next safe step.
Map a Repo Without Panic
By the end, learners can explain map a repo without panic, ask Codex for focused help, review the result, and decide the next safe step.
Find the Files That Control a Feature
By the end, learners can explain find the files that control a feature, ask Codex for focused help, review the result, and decide the next safe step.
Explain Data Flow and User Flow
By the end, learners can explain explain data flow and user flow, ask Codex for focused help, review the result, and decide the next safe step.
Ask for Risks and Unknowns
By the end, learners can explain ask for risks and unknowns, ask Codex for focused help, review the result, and decide the next safe step.
Create Repo Notes and AGENTS.md-Style Guidance
By the end, learners can explain create repo notes and agents.md-style guidance, ask Codex for focused help, review the result, and decide the next safe step.
Module Capstone: Codebase Orientation Report
By the end, learners can explain module capstone: codebase orientation report, ask Codex for focused help, review the result, and decide the next safe step.
Module Project
Create a practical artifact for codex for reading and understanding codebases: a prompt pack, checklist, issue brief, page draft, QA report, or deployment note.
Quiz
- What context should Codex inspect first?
- What should you review before accepting changes?
- What rollback step protects the work?
Answer key
Inspect relevant files and errors, review diffs and tests, and keep a backup, branch, or preview rollback plan.
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