Steps in setting up react-redux app

        create the react app by running npx create-react-app app_name

        install the redux package module by running npm i react-redux

create a reducer

         const countReducer = function (state = 0, action) {
          switch (action.type) {
            case "INCREMENT":
              return state + 1;
            case "DECREMENT":
              return state - 1;
            default:
              return state;
          }
        };

create a redux store

    import { createStore } from 'redux';
    let store = createStore(countReducer);

Wrap the main app component with a provider

          import { Provider } from 'react-redux';
          const App = () => (
            <Provider store={store}>    
              <h1>Helloworld PwC</h1>
            </Provider>
          );

Create and connect a container component

        import { Provider, connect } from 'react-redux';

        const Component = () => <h1>Helloworld </h1>;

        const Container = connect()(Component);

        const App = () => (
          <Provider store={store}>
            <Container />
          </Provider>
        );

Select and transform state from redux store

        const mapStateToProps = state => {
          return {
            count: state
          };
        };
        const Container = connect(mapStateToProps)(Component);

Use the state in the presentational component

        const Component = ({count}) => <h1>Helloworld {count}</h1>;

Add buttons to the presentational components

        const Component = ({count, handleIncrementClick, handleDecrementClick}) => (
          <div>
            <h1>Helloworld PwC {count}</h1>
            <button onClick={handleDecrementClick}>Decrement</button>
            <button onClick={handleIncrementClick}>Increment</button>
          </div>
        );

Pass Callback that dispatch action to store

          const mapDispatchToProps = dispatch => {
            return {
              handleIncrementClick: () => dispatch({ type: 'INCREMENT' }),
              handleDecrementClick: () => dispatch({type: 'DECREMENT'})
            }
          };
          const Container = connect(mapStateToProps, mapDispatchToProps)(Component);

In conclusion, To set up redux for your react app, the above steps would come in handy.

Thanks and Happy Hacking!!!