The Complete Guide to Reacting for Beginners in 2021

 

The Complete Guide to Reacting for Beginners in 2021

Welcome to the React Beginner's Guide. It aims to teach you all the React basics you need to know to start building React applications in 2021. 

 I created this resource to provide you with the most comprehensive and beginner-friendly way to learn React from scratch. 

 Finally, you will have an in-depth understanding of a large number of basic React concepts, including: 

 The reason, content, and method of React 

 How to easily create a React application 

  •  JSX and basic syntax 
  •  JSX elements 
  •  Components and attachments 
  •  Events in React 
  •  states and State Management 
  •  Basics of React Hooks 

 React Basics What exactly is 

 React? 

 React is officially defined as "a JavaScript library for creating user interfaces", but what does this mean? 

 React is a library written in JavaScript. We write JavaScript code to create great applications that run on the web. 

 What do I need to know to learn React? 

 In other words, do you need a basic understanding of JavaScript to become a solid React programmer? 

 The most basic JavaScript concepts you should be familiar with are variables, basic data types, conditions, array methods, functions, and ES modules. 

 How do I learn all these JavaScript skills? Check out the complete guide to learn all the JavaScript needed for React. 

 If React is developed in JavaScript, why don't we use JavaScript directly? 

 React is written in JavaScript, it was built from the ground up with the goal of creating web applications, and it provided us with the tools to do so. 

 JavaScript is a language with a history of more than 20 years, it was created to add a small amount of behavior to the browser through scripts, not to create a complete application. 

 In other words, although JavaScript was used to create React, they were created for completely different purposes. 

 Can I use JavaScript in React applications? Chapter 

 Yes! You can include any valid JavaScript code in your React application. 

 You can use any window or browser API, such as geolocation or retrieval API. 

 In addition, because React (at compile time) runs in the browser, it can perform common JavaScript operations such as queries and DOM operations. 

 How to create a React application 

 Three different ways to create a React application 

  •  Use an external script to put React into an HTML file 
  •  Use a React environment in your browser, such as CodeSandbox 
  •  Use a tool like Create React App on your computer What is the best way to create a React application on 
  • ? 

 What is the best method for you? The best way to create an application depends on what you want to use it for. 

 If you want to create a complete web application and finally send it to the web, it is best to use a tool like Create React App to create the React application on your computer. 

 If you are interested in creating React applications on your computer, see the complete guide to using the Create React application. 

 The easiest and most beginner-friendly way to create and build React apps for learning and prototyping is to use tools like CodeSandbox. You can create a new React app in a few seconds via react.new! 

 JSX elements 

 JSX is a powerful tool for creating applications 

 JSX is designed to facilitate the creation of user interfaces using JavaScript applications. 

 borrows its syntax from the most widely used programming language: HTML. Therefore, JSX is a powerful tool for building applications. 

 The following code example is the most basic example of a React element displaying the text "Hello world": 

 Hello, React! 

 Note that to display in the browser, the React element must be rendered (using ReactDOM.render()).

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