A simple JavaScript function that accepts props and returns a React element is known as a React functional component. Developing functional components has been the typical technique of writing React components in modern apps since the introduction of React Hooks.
You should use function components with hooks if you wish to adopt contemporary React. That's why most tutorials these days focus on contemporary React and don't include any class components. There's no need to panic if your "old" React project still employs class components (or other components).
Aside from the syntax, there isn't much of a difference between a functional component and a class component that just implements the render method. Both ways are helpful if you're looking to improve performance by removing unneeded renderings.
Because functional components are merely JavaScript functions, they are easier to test than Class components. With functional components, writing test cases and running tests is significantly easier. Jest is a test framework that is highly recommended. We can also run tests with the React Testing Library.
A functional component is nothing more than a simple JavaScript function that takes props as an argument and returns a React element. You must extend from React to use a class component. Create a render function that returns a React element for the component. In functional components, there is no render method.
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Very helpful course in learning ReactJS
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