Unofficial open-source guide, continuously updated. A Codex user manual written for developers, indie developers and heavy AI-tool users. It references the publicly accessible Codex App, Codex CLI, Codex IDE Extension and Codex Web/Cloud capabilities as of 2026-06-22; Codex updates fast, so install methods, model names, quotas, entry locations and command parameters may change - follow OpenAI official docs and your account. Third-party tools such as CC Switch and DeepSeek model connections are recorded only as extension methods. Contents: Part 1 - understand what Codex is (basic concepts, entry points). Part 2 - install, configure and environment prep (pre-install, Codex App install - most recommended, Codex CLI, IDE Extension, Web). Part 3 - core features (automation, plugins, Skills, MCP, code management with Git/GitHub workflow, cloud running, memory system). Part 4 - standard workflow (full chain from requirement to delivery, Codex task template library). Part 5 - practical case library (building a pet-treats storefront website; adding features and optimizing it; building an admin backend; a brand recruitment PPT; a promotional video). Appendix A: third-party model connections.
This course comes with a materials pack. Members receive the access link by email after requesting the course.