Should I use class or functional components in React?
Use functional components for all new code. They are the modern standard, simpler, and fully capable thanks to hooks. Use class components only to read existing code or answer interview questions.
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More FAQs in Class Components vs Functional Components: Which Should You Use?
Hooks gave functional components every capability class components had, with less boilerplate, easier code reuse through custom hooks, and better tooling support. The React team and ecosystem moved to functional components.
No. Hooks only work in functional components. This is one of the rules of hooks. If you need state or side effects in a class component, you must convert it to a functional component.
Yes, enough to read them. Existing codebases, older tutorials, and some interview questions still use class components and lifecycle methods. You do not need to write them, but you should understand them.
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