Should I pass entire objects as props?
Pass only what a component needs. Passing an entire user object when a component only needs the name creates unnecessary coupling and can cause extra re-renders. Keep props focused.
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More FAQs in How to Pass Data Between React Components Using Props
Pass the data as a prop on the child component in the parent's JSX, and read it from the props object inside the child. This is the default downward data flow in React.
Children cannot change parent state directly. The parent passes a callback function as a prop, and the child calls it with the new data. The parent updates its state, and the new data flows back down as props.
Siblings do not communicate directly. They share data through their common parent. One sibling sends data up via a callback, the parent stores it in state, and passes it down to the other sibling as a prop.
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