Quantitative Aptitude Questions and Answers with Solutions for Beginners

React Tutorial for Beginners: From Basics to Projects

React has become one of the most popular JavaScript libraries for building modern, interactive user interfaces. Developed and maintained by Facebook, React Tutorial allows developers to create fast, scalable, and reusable UI components. If you are new to web development or JavaScript frameworks, this tutorial will guide you step by step — from the basics of React to building real-world projects.

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 Why Learn React?

Before diving into the details, let’s understand why React has gained so much popularity:

• Component-Based: Applications are built using small, reusable components.

• Virtual DOM: Ensures faster updates and rendering of UI.

• Flexibility: Can be used with libraries or frameworks like Redux, Next.js, or even on mobile with React Native.

• Strong Community: Large support base with continuous updates and resources.

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 Getting Started with React

To start working with React, you need basic knowledge of HTML, CSS, and JavaScript. You can set up a React project in two ways:

1. Using Create React App

   npx create-react-app my-app
   cd my-app
   npm start
   

   This generates a ready-to-use React setup.

2. Using Vite (faster setup)

   npm create vite@latest my-app
   cd my-app
   npm install
   npm run dev
   

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 React Basics You Must Know

1. JSX (JavaScript XML)

React uses JSX, which looks like HTML but works inside JavaScript. Example:

function Welcome() {
  return <h1>Hello, React!</h1>;
}

2. Components

Components are the heart of React. They can be functional or class-based.

function Greeting(props) {
  return <h2>Hello, {props.name}</h2>;
}

3. Props

Props are like function arguments — they allow data to be passed between components.

4. State

State manages data that changes over time. Example using useState:

import { useState } from "react";

function Counter() {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>Click Me</button>
    </div>
  );
}

5. Hooks

Hooks like useState, useEffect, and useContext make functional components powerful and dynamic.

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 Building a Simple Project – To-Do App

Let’s create a small project to put everything into practice.

import { useState } from "react";

function TodoApp() {
  const [tasks, setTasks] = useState([]);
  const [input, setInput] = useState("");

  const addTask = () => {
    if (input.trim() !== "") {
      setTasks([...tasks, input]);
      setInput("");
    }
  };

  return (
    <div>
      <h2>My To-Do List</h2>
      <input
        type="text"
        value={input}
        onChange={(e) => setInput(e.target.value)}
        placeholder="Enter a task"
      />
      <button onClick={addTask}>Add Task</button>
      <ul>
        {tasks.map((task, index) => (
          <li key={index}>{task}</li>
        ))}
      </ul>
    </div>
  );
}

export default TodoApp;

This project teaches you about state management, rendering lists, and event handling.

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 Next Steps After Basics

Once you are comfortable with the fundamentals, explore these concepts:

• React Router for navigation between pages.

• Context API / Redux for managing global state.

• API Integration using Fetch API or Axios.

• Styling with CSS Modules, Styled Components, or TailwindCSS.

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 Best Practices in React Development

1. Keep components small and reusable.

2. Use meaningful names for components and props.

3. Avoid unnecessary re-renders with React.memo().

4. Organize your project structure for scalability.

5. Follow coding standards and linting tools.

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 Conclusion

React Tutorial is not just a library — it’s a foundation for building high-performance, scalable applications. By mastering React basics such as components, props, state, and hooks, you can easily progress to advanced features like routing and state management. Practice by building projects like a to-do app, weather app, or blog application.

With consistency and hands-on coding, you’ll be well on your way to becoming a proficient React developer. 

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