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GSGurmeet Singh
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eBook · 23 chapters

React Beyond Tutorials

From your first component to a production-ready app

Author: Gurmeet Singh

A hands-on guide to modern React (React 19) with TypeScript, from your first component to production. You learn each idea by using it to build TrackIt, a real job-application tracker, then go beyond the basics into the system design that senior interviews ask about: folder architecture, component patterns, service layers, auth and roles, and rendering strategies. No filler theory: every concept comes with a practical reason, working code, the mistakes developers actually make, and the habits teams use in production.

What you'll be able to do

  • Set up and structure a modern React + TypeScript project with Vite
  • Think in components and pick the right place for every piece of state
  • Build forms with validation, including React 19 Actions
  • Fetch server data without race conditions, with TanStack Query
  • Add routing, protected pages and custom hooks you can reuse
  • Find and fix slow renders, and know when memoization is worth it
  • Design a codebase that scales: folder architecture, naming, barrels and environments
  • Build a layered service architecture with centralized error handling and token refresh
  • Handle roles, permissions, XSS and CSRF the way production apps do
  • Choose between CSR, SSR, SSG and React Server Components, and explain why
  • Test components the way users use them, then ship with CI and monitoring
  • Answer the React and frontend system design questions interviewers actually ask

Your learning roadmap

  1. Weeks 1–2 · Foundations

    Why React exists, a modern Vite + TypeScript setup, JSX, components, lists and conditional rendering.

  2. Weeks 3–4 · State & interaction

    How rendering really works, events and forms, where state should live, and Context.

  3. Week 5 · Effects, data & routing

    Effects and refs done right, fetching data safely, and multi-page apps with React Router.

  4. Weeks 6–7 · Building like a pro

    Custom hooks, reusable components, styling, accessibility, performance and error handling.

  5. Weeks 8–9 · Architecture at scale

    System design, component patterns, service layers, auth and roles, and rendering strategies (CSR, SSR, SSG, Server Components).

  6. Week 10 · Shipping

    Testing, production hardening, deployment, and interview preparation.

Contents

2 free preview chapters · about 3.5 hours of reading, plus the hands-on project work

Part 1 · Foundations

  1. 1. Why React ExistsBefore we write a single line of React, let's answer the question most tutorials skip: why was React even created? If you understand the problem it solves, every other chapter in…Free6 min
  2. 2. A Modern Setup: Vite + TypeScriptIn this chapter we'll create the TrackIt project, understand every important file in it, and answer a question that confuses a lot of developers: where does a React app actually…Free8 min
  3. 3. JSX and ComponentsMost developers think this: They believe React understands HTML. It doesn't. React has no idea what JSX is. JSX gets converted into plain JavaScript before React ever sees it.…7 min(locked)
  4. 4. Lists, Keys and Conditional RenderingAlmost every screen you'll build is a list: products, messages, notifications, job applications. And lists change. Items get added, deleted, sorted and filtered. In this chapter…8 min(locked)

Part 2 · State & Interaction

  1. 5. State and How Rendering Really WorksSo far TrackIt only shows data. Click a filter button and nothing happens. In this chapter we fix that with state, and then we open the hood to see what React actually does when…12 min(locked)
  2. 6. Events and FormsTrackIt can change and delete applications, but you still can't add one. In this chapter we build the "Add application" form. Along the way you'll learn how React handles events,…10 min(locked)
  3. 7. Where State Should LiveKnowing useState is easy. Knowing where to put each piece of state is what separates a clean React app from a messy one. Put state too low and components can't share it. Put it…8 min(locked)
  4. 8. Sharing State with ContextSome data is needed almost everywhere: the logged-in user, the theme, the language. Passing it through every component as props gets painful fast. Context lets a parent make a…9 min(locked)

Part 3 · Effects, Data & Routing

  1. 9. Effects and Refs, the Right WayuseEffect is the most misused hook in React. Half the effects in a typical codebase shouldn't exist, and the other half are missing a cleanup. In this chapter you'll learn what…9 min(locked)
  2. 10. Fetching Data Like a ProReal apps don't keep their data in localStorage. It lives on a server, and the moment you fetch it you have new problems: loading spinners, errors, slow networks, stale data, and…10 min(locked)
  3. 11. Pages and Navigation with React RouterTrackIt is one long page. Real apps have many: a dashboard, a details page for each application, settings, a sign-in screen, and a friendly 404. In this chapter we add routing…9 min(locked)

Part 4 · Building Like a Pro

  1. 12. Custom Hooks and Reusable ComponentsBy now TrackIt has the same little patterns in several places: read something from localStorage, write it back, handle the errors. Copy-pasting logic like that is how bugs…9 min(locked)
  2. 13. Styling with Tailwind and Building Accessible UITrackIt works, but it looks like 1998. In this chapter we style it with Tailwind CSS, the most popular styling choice in React projects today, set up proper dark mode, and build a…7 min(locked)
  3. 14. Performance: Measure, Then OptimizeReact is fast by default. Most "performance problems" in React apps come from a few specific causes, and most "optimizations" people add don't help at all. This chapter teaches…8 min(locked)
  4. 15. Handling Errors GracefullySomething will go wrong in production. An API returns unexpected data, a network drops, a user finds the one path you didn't test. What matters is what happens next: a blank white…7 min(locked)

Part 5 · Architecture at Scale

  1. 16. React System Design: Structure, Naming and ConfigEverything so far was about making React work. This part is about making a React codebase survive: a team of six, two years of features, and the new developer who joins next…10 min(locked)
  2. 17. Component Design PatternsDesign patterns are named solutions to problems that keep coming back. They aren't folder rules and you don't pick one for the whole project; you use whichever fits the problem in…8 min(locked)
  3. 18. The Service Layer and Error HandlingIn tutorials, fetch sits inside a component. In a real app that quickly becomes a problem: endpoints scattered across dozens of files, no single place to attach auth headers, the…9 min(locked)
  4. 19. Auth, Roles and Route ArchitectureChapter 11 gave TrackIt pages. This chapter makes that routing survive a real app with fifty routes and several user roles: routes grouped per feature, lazy loading with sensible…9 min(locked)
  5. 20. Rendering Strategies: CSR, SSR, SSG and RSCTrackIt is a client-rendered app: the browser downloads JavaScript, and React builds the page. That's the right choice for a dashboard behind a login. It's the wrong choice for a…8 min(locked)

Part 6 · Shipping

  1. 21. Testing React AppsTests are what let you change code without fear. Refactor the list, upgrade a library, rename a prop: if the tests pass, users won't notice. In this chapter we set up Vitest and…9 min(locked)
  2. 22. Getting Ready for Production"It works on my machine" is where most tutorials stop. Real apps need configuration per environment, security basics, a build that's small and cached well, automatic checks on…7 min(locked)
  3. 23. Interview Prep and What's NextYou started with "why was React even created?" and ended with a tested, deployed app. This last chapter helps you turn that into a job or a promotion: a checklist of what you now…10 min(locked)