The tick() method is called once per second by the browser. The Clock component calls setState() with an object representing the current time to schedule a UI update. React recognises that the state has changed as a result of the setState() function and uses the render() method again to understand what should be on the screen.
useState() useState() hook allows you create and mange a state variable that can be a simple JavaScript primitive or an object.
applyReducer () When you'd rather modify state with reducers and actions, useReducer() is called.
useRef()
useContext()
stars.
State is a JavaScript object that stores and controls the behaviour of a component's dynamic data. Because state is dynamic, it allows a component to maintain track of changing data between renderings while remaining dynamic and interactive. Only within a class component can state be used.
When you implement state management, data flows from your app to the state and vice versa. You are aware of the actual location of your data. These state management solutions also provide a snapshot of the full data at a specific point in time. As a result, you'll always know where your data is, which will speed up your work.
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Very helpful course in learning ReactJS
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VERY GOOD COURSE OF REACT JS
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Syed manzoor ali
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This series is usefull for just starting and building confident. Go further and explore more about React JS
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