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A curated walkthrough of the library — ordered lessons, a 15-question quiz between each, and 3 next-steps so you stay in flow. Earn XP, badges, and a streak as you go.
Lessons · 6434 available · Coding view · Codex
You are viewing coding lessons focused on Codex. Use the tool lanes below to jump sideways into related workflows.
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693 lessons in coding
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Lessons handpicked for the Codex shelf.
The AI coding tool market fragmented fast. Let's map the 2026 landscape honestly: who is for autocomplete, who is for agents, who wins on cost, and what the tradeoffs actually feel like.
Healthcare, finance, government — Codex can run there, but the deployment story changes. Audit logs, data residency, and human approval gates become non-negotiable.
Claude Code (Anthropic) and Codex CLI (OpenAI) are both terminal agents — different vibes, similar power.
Codex cloud can work in the background and in parallel. Learn how to split tasks so multiple agents do not trample the same files.
Fresh Codex lessons added to the library.
AI helps engineers wire OpenAI Codex CLI into build pipelines as a first-class step.
Claude Code (Anthropic) and Codex CLI (OpenAI) are both terminal agents — different vibes, similar power.
Use cloud agents for bounded, parallel tasks that can land as branches or PRs while you keep working locally.
Codex reads project guidance files so the agent can follow local conventions. Scope and precedence decide which instruction wins.
Subject tracks
Claude Code isn't just a coding assistant — it's a general agent runtime with MCP, subagents, hooks, and skills. Treat it that way and you get a free, powerful platform.
Log every agent action so you can debug, audit, and learn from runs after the fact.
The AI coding tool market fragmented fast. Let's map the 2026 landscape honestly: who is for autocomplete, who is for agents, who wins on cost, and what the tradeoffs actually feel like.
AI app builders turn a prompt into a running app in minutes. Learn the strengths, the ceilings, and the moment you should eject to a real IDE.
AI is a power tool. Some tasks are wrong for it. Learn the categories where AI assistance reliably makes things worse, and the human-only judgment calls AI cannot replace.
API decisions are hard to undo. AI can review API designs against established patterns, surface forward-compatibility risks, and identify the decisions that look fine now but will hurt in production.
AI generates tests fast — including tests that don't actually test anything. Disciplined adoption produces real coverage gains.
Use Claude to read NOTICE files, flag GPL contamination, and draft compliance reports.
Use Claude to consolidate redundant CI jobs and propose matrix reductions.
Cursor forked VS Code and rebuilt it around AI. It's now the de facto AI IDE for serious engineers. Deep dive on what makes it different, the Composer agent, and the $500/month enterprise pricing.
Windsurf (from Codeium, acquired by OpenAI in 2025) competes with Cursor via Cascade, its autonomous agent. Deep look at where it's ahead, where it's behind, and the post-acquisition future.
The Perplexity API gives you cited search answers with one call. It is the cheapest way to add grounded retrieval to a product — and the limits are worth understanding.
Perplexity now lets you build small AI tools — surveys, structured queries, mini apps — on top of its retrieval. Build features are uneven, but powerful for the right job.
Healthcare, finance, government — Codex can run there, but the deployment story changes. Audit logs, data residency, and human approval gates become non-negotiable.
AI RAG Frameworks — a structured comparison so you can pick a tool by fit rather than vibes.
AI Red-Team Platforms — a structured comparison so you can pick a tool by fit rather than vibes.
Follow a real agent run step by step — from prompt to result — and see exactly what happens inside. No code yet, just the anatomy of a successful task.
Agents are only as useful as their tools. Tour the big three — filesystem, browser, code execution — plus the emerging MCP ecosystem, with examples of what each unlocks.