Why should beginners understand React's rendering flow?
Because it gives you a mental model to debug problems like a UI not updating. Without it, React feels like magic and bugs become impossible to reason about. Understanding the flow turns magic into logic.
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More FAQs in How React Renders JSX Into the DOM: A Beginner's View
JSX is compiled by a build tool or Babel into React.createElement calls that return plain JavaScript objects describing the UI. ReactDOM then takes those objects and creates or updates real DOM nodes to match.
It is the function JSX compiles down to. It returns a plain JavaScript object describing an element, including its type, props, and children. This object is React's description of the UI.
ReactDOM takes React's UI description and creates or updates real DOM nodes to match it. On the first render it creates nodes; on later renders it updates only the parts that changed.
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