An action in Redux is an object that describes a change in the Redux store state. Actions are the only way to update the state of the Redux store, and they must have a type property that describes the type of action being performed. In addition to the type property, actions can also have additional data that is used to update the state.

To create a props proxy for an HOC component, you can wrap the component with another component that adds the additional props. This is done by defining a new component that takes the original component as input and returns a new component that includes the additional props.

React supports both mouse and touch events through the use of Pointer Events. Pointer Events are a standardized event model that provide a unified way to handle mouse, touch, and stylus input. React provides a set of event handlers for Pointer Events, such as "onPointerDown" and "onPointerMove", that can be used to create responsive and touch-friendly user interfaces.

JSX is a syntax extension for JavaScript that allows developers to write HTML-like syntax in their JavaScript code. While JSX is the preferred way to write React components, it is not strictly required. React components can also be written using plain JavaScript syntax, although this can be more verbose and difficult to read. However, JSX is widely used in the React community and is considered a best practice for writing React components.

In React using ES6 classes, "super()" is used to call the constructor of the superclass, while "super(props)" is used to pass props to the constructor of the superclass. The "super(props)" syntax is necessary if you need to access props in the constructor of a subclass.

Render hijacking is a technique used in React where a component modifies the rendering behavior of its children by wrapping them in higher-order components (HOCs). This can be used to add or modify props, add event handlers, or manipulate the rendering of the children in other ways. While this can be a powerful technique, it can also lead to code that is difficult to reason about and maintain.

Redux DevTools is a browser extension and development tool that provides a visual interface for debugging and inspecting the state of a Redux application. It allows you to track and debug state changes, as well as inspect actions and reducers in real-time.

React is a JavaScript library for building user interfaces. It was developed by Facebook and is now maintained by a community of developers. React allows developers to create reusable UI components using JavaScript. These components can then be combined to create complex user interfaces.

mapStateToProps() is used to map the application state to the props of a React component, while mapDispatchToProps() is used to map dispatch functions to the props of a React component. The dispatch functions are used to dispatch actions to the Redux store, allowing the component to update the application state.

In React, you can define constants using the "const" keyword. Constants are variables that cannot be reassigned or redeclared, and are used to store values that will not change throughout the lifetime of the component. For example: const API_KEY = '12345';.