Codex Mastery
Go from "I typed a prompt into ChatGPT once" to genuinely dangerous with Codex, OpenAI's agentic coding tool. 5 modules, 20 lessons. CLI, AGENTS.md, sandboxing, MCP, cloud tasks, multi-agent delegation, code review, and the newest features as of late 2026. Practical, no fluff, built for people who ship.