The "componentWillReceiveProps" and "componentWillUpdate" lifecycle methods are going to be deprecated in React v16. These methods will be replaced with new lifecycle methods that are more efficient and easier to reason about. The new methods are "getDerivedStateFromProps" and "getSnapshotBeforeUpdate".

In React Router v4, you can get the history object by using the "this.props.history" object passed to the component. This object contains the current history of the router, including the current location, previous locations, and navigation history. You can use this object to programmatically navigate, access the current URL, or manage the browser history.

To dispatch an action on load, you can use a lifecycle method in a React component, such as componentDidMount(). This method is called once the component has mounted, allowing you to dispatch an action to the Redux store.

The main difference between Flow and PropTypes is that Flow is a type checking tool for JavaScript that checks types at compile-time, while PropTypes is a runtime type checking library for React components that checks types at runtime. Flow is particularly useful in large codebases where it can be difficult to keep track of all the variables and function calls, while PropTypes is useful for catching errors in React components at runtime.

The suspense component is a component for delaying rendering in React. The suspense component allows components to wait for asynchronous data to load before rendering, improving the user experience and reducing loading times. The suspense component is typically used with code splitting and lazy loading to enable on-demand loading of code.

ReactDOM is separated from React in order to improve performance and reduce the bundle size of React applications. Separating the rendering logic from the component logic allows for more efficient updates and reduces the amount of JavaScript that needs to be downloaded by the client. This separation also allows for easier integration with other rendering targets, such as native mobile apps or desktop applications.

Strict mode in React is a mode that highlights potential problems in the code, such as deprecated lifecycle methods or unsafe practices. It can help identify issues early on and improve the overall quality of the code. Strict mode can be enabled globally or for individual components.

The main goal of React Fiber is to improve client-side rendering performance. It does this by introducing a new algorithm for rendering updates that is more efficient and flexible than the previous algorithm. With React Fiber, React can break up large updates into smaller chunks, prioritize updates, and pause and resume updates as needed.

In React, components can be prevented from rendering unnecessarily by using the shouldComponentUpdate() lifecycle method. By implementing this method, components can determine whether an update is necessary before rendering. This can help improve performance by minimizing the number of unnecessary re-renders.

Redux selectors are functions that transform the Redux state into a more useful format for the application. They allow you to abstract the details of the state shape and provide a simpler interface for accessing and manipulating the state. This helps to keep the code more maintainable and reduces the risk of bugs when the state shape changes.