React

Build your first interactive component today: you'll write JSX, manage state with useState, and see React's core hooks in one sitting, before anything else in this path builds on it.

Give the props and hooks from step 1 real shapes: interfaces catch a mistyped prop before your browser ever does.

Turn the basic form patterns from step 1 into something a real app can ship: react-hook-form and Zod validate every field with the types you defined in step 2.

Move data that step 1's local state can't reach: Zustand and Jotai let two distant components share one source of truth without prop drilling.

Split your typed components from step 2 across real URLs: loaders and actions fetch and save data right inside the route itself.

This is where the useEffect data fetching from step 1 finally clicks into something automatic: TanStack Query caches, refetches, and dedupes requests so you stop hand-rolling fetch logic on every route from step 5. Expect to rewrite a few fetches before it feels natural.

Prove the routes and queries from steps 5 and 6 actually work: Testing Library renders your components the way a user would click through them.

Vitest in step 7 proves a component behaves; Storybook is where you build and review it in isolation, every loading, error, and empty state on one page before it ever lands inside a route from step 5.

Landing in a codebase still standing on Redux Toolkit is where this pays off: the same reducer thinking step 4's Zustand used, just with more boilerplate and a deeper DevTools history.

Shipping production UI fast is where shadcn/ui pays off: accessible components typed with step 2's TypeScript, built on Radix primitives you own outright instead of an npm black box.

Pointing your React skills at mobile is where this pays off: most of steps 1, 2, and 4 transfer directly, the same typed components, hooks, and state, just native views underneath instead of the DOM.

Pull every earlier step into one shippable app: Next.js wraps your typed components, routing, and data fetching from steps 2 through 7 into a single deployable build, this time rendered server-first by default.

Everything from step 1's first component to step 12's Next.js build finally goes live: preview deployments on every pull request, environment variables that differ per environment, and the edge runtime that serves what you built to real users.