A course you run in your own terminal
Master the AI coding CLIs developers actually use
A hands-on course that gets you fluent in the three frontier-model coding tools — Claude Code (Anthropic), OpenAI Codex, and the Google Gemini CLI — plus how to choose between them and prompt each one well.
19 modules · knowledge checks · one-time Premium upgrade
Three frontier CLIs, taught side by side
Agentic coding tools read your files, run commands, edit code, and carry out multi-step tasks — asking permission at the points that matter. Learn the concepts once, and the commands for each.
Claude Code
Fundamentals through mastery: installation, slash commands and skills, agentic workflows, plus the Advanced Track and a searchable cheatsheet.
OpenAI Codex CLI
From a free overview to a full deep-dive: codex exec,
approval and sandbox modes, AGENTS.md, MCP, and
Codex cloud.
Google Gemini CLI
The Gemini CLI, API, and AI Studio — auth options, flags, slash
commands, GEMINI.md, and model selection.
Public
Open to everyone
Core Concepts and Getting Started are fully public — no account, no sign-up. Read them right now.
Start with Core ConceptsFree account
The full free track
A free account unlocks the rest of the free modules — and lets your progress follow your login, on any device.
Create a free accountPremium
Everything, forever
One purchase unlocks the searchable Cheatsheet, the Advanced Track, and every provider deep-dive — and your progress follows your login here too.
See what's includedSimple pricing
The fundamentals are free forever. Premium is $49 one-time — no subscription. Already bought it? Redeem your license key on the pricing page.