OpenAI’s Codex is a coding agent that lives in a desktop app, designed to help you complete real tasks through natural language conversations. To get started, download the app, sign in with your ChatGPT account, and create your first thread—think of it like a focused chat where you and Codex work together. Organize your work by creating a main ‘Codex’ folder, with subfolders for each project. Keep it simple: start with a small task like organizing notes or cleaning up a dataset. When you’re working in a project, use ‘Work locally’ mode with default permissions—this keeps Codex locked to that folder, so it can’t mess with anything else on your computer. As you get comfortable, you can try full permissions, but only when you understand what Codex is doing. A great first prompt is asking for something basic and useful. Why it matters: Mastering Codex early is key because it represents a shift from chat-based AI to task-completing agents that can actually get stuff done on your machine, marking a leap toward truly practical AI assistants.