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JavaScript Mastery

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Agentic Development Skills

Nine open-source, battle-tested skills that turn Claude, Cursor & Codex into a senior engineering teammate. Free forever.

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Popular Courses

TanStack Pro Course
Master TanStack Start to build scalable, high-performance web apps. Learn everything about routing; data fetching; server functions; server routes; caching; SEO; and more.
The Ultimate Next.js 16 Course
Learn Next.js 16 from the ground up and build production-ready, fullstack ReactJS apps with the Next.js framework
The Complete Testing Course
The only Next.js testing course that teaches you how to test real, production-grade applications.
Web Animations Full Course | Build a GTA VI Website & Master GSAP
Learn GSAP animation with JS Mastery. Practical GSAP tutorials, real projects with transitions, effects, performance tips, and much more in our online GSAP course.
Dev Career Accelerator
Kickstart your development career with proven strategies, practical tactics, and actionable insights to land your first job and level up fast.
Vanilla Three.js Course
JavaScript-based WebGL engine that can run GPU-powered games and other graphics-powered apps straight from the browser.

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