reactjs online training

React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It allows the composition of complex UIs from small and isolated pieces of code called "components"

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. Sometimes referred to as a frontend JavaScript framework, React was created by Facebook and is a tool for building UI components. It works by creating a virtual DOM in memory, where it does all the necessary manipulating before making the changes in the browser DOM. React only changes what needs to be changed, which makes it efficient

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. React is popular for creating web apps that can change data without reloading the page, and it is easy to use and quick. It has a large developer community that supports the React library, providing plenty of resources for learning

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. React is component-based and responsible only for the view layer of a Model-View-Controller (MVC) template. It is used to create modular user interfaces and promotes the development of reusable UI components. React can be used on the server with Node.js as well

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. JSX, a syntax extension to JavaScript, is recommended for use with React to describe what the UI should look like. It produces React "elements" and is used to construct the DOM and keep it up to

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