Antigravity AI IDE Tutorial: Free Access to Gemini 3 Pro & Sonnet 4.5

Discover the new Antigravity AI editor! This tutorial guides you from scratch on how to install, configure, and use this powerful IDE. Learn to leverage the built-in Google Gemini 3 Pro and Sonnet 4.5 models for free. We'll cover basic operations, the Agent Manager, and project-level customization with rules and workflows. This comprehensive guide is perfect for beginners and developers eager to explore the latest in AI-powered coding tools.