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Codex Essentials for Beginners

Learn to define one small change, explain what you need, and check the result

开始学习
全部章节
10
Locale
English
课程类型
开放课程

Start with a small change, such as a login-form fix. Choose a task, define its scope, and ask Codex to read the code before editing. Then inspect the actual file changes and check results to decide whether to accept the work, verify further, or pause.

适合人群

  • First-time Codex users who can read a little code
  • People who have used AI to write code but are unsure how to judge whether its changes are correct

解决的问题

  • You do not know which task to give Codex first
  • “Improve this” leaves the scope and checks unclear
  • In an unfamiliar project, you are unsure whether to investigate first or start editing
  • Codex says it is done, but there is not enough evidence to accept the change

学完收获
  • Choose a small task that is easy to check and undo, then select a suitable way to work with Codex
  • State the goal, relevant files, editing limits, and completion criteria
  • Review the initial investigation and plan for unsupported conclusions or unnecessary changes
  • Use actual file changes and check results to decide whether to accept the work, verify further, or pause
  • Identify high-risk operations and state what must be confirmed before execution
  • Plan seven days of practice using the record of one task completed with Codex

课程亮点

  • Follow one small change from start to finish using examples such as a login form
  • Assess what automated checks and human review each demonstrate
  • Practice spotting unrelated changes and unverified behavior when reviewing completed work

全部章节

10 个章节

Lesson 1: First, Understand Codex

Explain Codex as a coding agent that understands a project and acts on development tasks, distinguish it from plain chat AI, code completion, and IDEs, and state the human responsibility boundary.

Lesson 2: What Should You Let Codex Do?

Classify tasks as suitable, cautiously suitable, or not yet suitable by goal clarity, scope control, verifiability, and risk, and choose between direct changes, planning first, or advice only.

Lesson 3: Choose the Right Entry Point

Choose among App, IDE, CLI, and Cloud/Web entry points based on the project context, file and command actions, collaboration location, permissions, and acceptance method the task needs.

Lesson 4: State the Task Clearly

Diagnose vague development requests and rewrite them into Codex tasks with a single goal, clear scope, and verifiable results using Goal, Context, Constraints, and Done when.

Lesson 5: Let Codex Understand the Project First

When a problem involves unfamiliar structure, many files, or an unknown cause, require Codex to explain the current state with file evidence and a minimal plan inside a defined reading range, without modifying anything yet.

Lesson 6: Let Codex Complete One Small Change

Design and review a Codex small-change task with a single goal, clear allowed and forbidden ranges, low risk, and acceptance through concrete evidence.

Lesson 7: Confirm It Really Worked

Choose automatic or manual verification with real coverage based on the change type, record commands and results, distinguish success, failure, and unverified parts, and judge completion accordingly.

Lesson 8: Check What It Changed

Inspect Codex's file range, goal alignment, stated reasons, and out-of-scope risk with the actual diff and verification evidence, then decide to accept, question, pause, add verification, or roll back.

Lesson 9: Confirm High-Risk Operations Before Execution

Identify high-risk Codex operations by reversibility, impact range, external side effects, and sensitivity; require plan, scope, rollback, and confirmation before approval, and rewrite dangerous instructions.

Lesson 10: Build Your Codex Habit

Review task expression, planning, changes, verification, diff review, and risk control from the evidence of one real Codex collaboration, and form a small-step, checkable practice route.