React.js Tutorial
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Tutorials React.js Tutorial

React Get Started — Complete Guide

React Get Started — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of React.js Tutorial on Toolliyo Academy.

8 min read Updated 6/23/2026
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React.js Tutorial · Lesson 2 of 100

React Ecosystem

Beginner → Intermediate → Advanced → Professional

Beginner · 1 — Foundations · ~12 min read · Module 1: Introduction & Setup

Introduction

This lesson is part of the beginner section. We explain React Ecosystem slowly, with examples you can copy and run. If something is unclear, read it twice — that is how everyone learns. React alone only draws the UI. Around it you will hear names like Vite (starts your project), React Router (different pages), and TanStack Query (loading data from a server). Together they are called the React ecosystem — extra tools people add when they need them. You do not install everything on day one. Knowing the names stops you from feeling lost when job posts or tutorials mention them. We introduce each tool in its own lesson when you actually need it.

React Ecosystem is setup knowledge. Without it, nothing else in React will run. Spend time here until commands work without copy-paste errors.

When will you use this?

You need this before writing any React code — same as installing Word before writing a document.

  • Every React job expects you to run projects locally with Node and a build tool like Vite.
  • Interviewers often ask you to clone a repo and run npm install && npm run dev on day one.

Real-world: Toolliyo LMS tech stack

Toolliyo ships as a single React SPA today but the team already picked libraries for routing, forms, and API caching. They add tools only when a feature needs them — not on day one.

Production-style code

// package.json (excerpt) — real Toolliyo-style stack
{
  "dependencies": {
    "react": "^19.0.0",
    "react-dom": "^19.0.0",
    "react-router-dom": "^7.0.0",
    "@tanstack/react-query": "^5.0.0",
    "react-hook-form": "^7.0.0",
    "axios": "^1.7.0"
  },
  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "preview": "vite preview",
    "lint": "eslint src --ext js,jsx"
  }
}

// Added over time:
// Week 1: Vite + React only
// Week 4: react-router-dom (multiple pages)
// Week 8: TanStack Query (course API caching)
// Week 12: react-hook-form (instructor onboarding)

What happens in production: Developers onboard faster because the stack is documented in package.json — same pattern at Flipkart, Zoho, and most product teams.

Lesson example (start here)

Copy this smaller example first. Once it works, compare it with the real-world code above.

// Typical stack for a new app
// Build: Vite
// Pages: react-router-dom
// Server data: @tanstack/react-query
// Forms: react-hook-form

Line-by-line walkthrough

CodeWhat it means
// Typical stack for a new appComment — notes for humans; the computer ignores it.
// Build: ViteComment — notes for humans; the computer ignores it.
// Pages: react-router-domComment — notes for humans; the computer ignores it.
// Server data: @tanstack/react-queryComment — notes for humans; the computer ignores it.
// Forms: react-hook-formComment — notes for humans; the computer ignores it.

How it works (big picture)

  • Think of React as the engine.
  • Vite starts the project, Router handles URLs, and Query manages API data.
  • Each tool solves one problem well.

Do this on your computer

  1. Create a Vite React app.
  2. When you need multiple pages, install react-router-dom.
  3. When you fetch from an API, consider TanStack Query in a later lesson.
  4. Read the real-world section and name which part of the app uses this topic.
  5. Run the example locally and confirm the same behavior in the browser.
  6. Change one value in the example (text, initial state, or URL) and predict what will happen before you save.

Experiments — try changing this

  • Change text or labels in the example and save — watch the browser update.
  • Break the code on purpose (remove a bracket), read the error message, then fix it.

Remember

React = UI library; other tools handle build, routing, and data. Start small: Vite + React only. Add libraries when you hit a real need.

Common questions

React vs Next.js?

React is the UI library. Next.js is a framework built on React with routing and server features built in.

What is Vite?

A fast tool that bundles your React code for development and production.

React.js Tutorial
Course syllabus
Module 1: React Basics & Setup Introduction to React — Complete Guide React Get Started — Complete Guide Your First React App — Complete Guide React Render HTML — Complete Guide ES6 for React — Complete Guide JSX Intro — Complete Guide JSX Expressions — Complete Guide JSX Attributes — Complete Guide JSX If Statements — Complete Guide React Components — Complete Guide
Module 2: Props, Events & Lists React Props — Complete Guide Props Destructuring — Complete Guide Props Children — Complete Guide React Events — Complete Guide React Conditionals — Complete Guide React Lists & Keys — Complete Guide React CSS Styling — Complete Guide Controlled Forms — Complete Guide Form Submit — Complete Guide Multiple Form Inputs — Complete Guide
Module 3: Forms & Hooks Textarea & Select — Complete Guide Checkbox & Radio — Complete Guide useState — Complete Guide useEffect — Complete Guide useRef — Complete Guide useContext — Complete Guide useReducer — Complete Guide useCallback — Complete Guide useMemo — Complete Guide Custom Hooks — Complete Guide
Module 4: Routing & Data React Router — Complete Guide Nested Routing — Complete Guide Protected Routes — Complete Guide Lazy Routes — Complete Guide React Portals — Complete Guide Fetch API — Complete Guide Axios — Complete Guide Error Handling — Complete Guide Context API — Complete Guide React Hook Form — Complete Guide
Module 5: State & Authentication Form Validation — Complete Guide Async Forms — Complete Guide Zustand — Complete Guide Redux Toolkit — Complete Guide TanStack Query — Complete Guide Optimistic Updates — Complete Guide Query Caching — Complete Guide Authentication Flows — Complete Guide React 19 Features — Complete Guide package.json & Tooling — Complete Guide
Module 6: Architecture & React 19 Enterprise Folder Structure — Complete Guide Enterprise State Architecture — Complete Guide Enterprise Form Architecture — Complete Guide Actions — Complete Guide use() — Complete Guide Suspense — Complete Guide Concurrent Rendering — Complete Guide React Compiler — Complete Guide Server Components — Complete Guide Streaming Rendering — Complete Guide
Module 7: Performance Hydration — Complete Guide Memoization — Complete Guide React.memo — Complete Guide Lazy Loading — Complete Guide Code Splitting — Complete Guide Virtualization — Complete Guide Bundle Optimization — Complete Guide Web Vitals — Complete Guide Frontend Performance Tuning — Complete Guide Micro Frontends — Complete Guide
Module 8: Full-Stack & Real-Time Enterprise Scaling — Complete Guide SignalR — Complete Guide WebSockets — Complete Guide SSE — Complete Guide Next.js — Complete Guide SSR — Complete Guide SSG — Complete Guide ISR — Complete Guide ASP.NET Core Integration — Complete Guide Full-stack Enterprise Architecture — Complete Guide
Module 9: Testing & Deployment XSS Protection — Complete Guide Secure Authentication — Complete Guide Jest — Complete Guide React Testing Library — Complete Guide Cypress — Complete Guide Playwright — Complete Guide Docker Deployment — Complete Guide Kubernetes — Complete Guide Azure Deployment — Complete Guide CI/CD Pipelines — Complete Guide
Module 10: ShopCart Projects Todo App Project — Complete Guide E-Commerce Storefront Project — Complete Guide SaaS Admin Panel Project — Complete Guide Banking Dashboard Project — Complete Guide LMS Course Player Project — Complete Guide Healthcare Portal Project — Complete Guide Real-Time Monitoring Project — Complete Guide Multi-Tenant SaaS Project — Complete Guide Enterprise CRM Project — Complete Guide Micro Frontend Platform Project — Complete Guide
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