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.

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.

To enable production mode in React, you can set the NODE_ENV environment variable to "production". This will trigger various optimizations and remove development-only code from the bundle. You can also use the "process.env.NODE_ENV" variable in the code to conditionally enable certain features.

There are several ways to add Bootstrap to a React application, including installing the Bootstrap npm package and importing it into your components, linking to the Bootstrap CSS and JavaScript files in your HTML file, and using a third-party React Bootstrap library.

The strict mode feature in React is used to identify potential problems in code early on in the development process. It activates additional checks and warnings for common mistakes and unsafe operations, such as using deprecated lifecycle methods or modifying props directly. This can help prevent bugs and improve the overall quality of the code.

React uses className instead of class attribute to avoid naming conflicts with the JavaScript class keyword. Using className also makes it easier to use CSS modules and other tools that work with class names.

In React Intl, you can access the current locale by using the "intl" object provided by the "injectIntl" higher-order component. This object contains information about the current language, locale, and formatting options, and can be used to format text and data in the correct format. For example: const { locale } = this.props.intl;.

The children prop is a special prop in React that contains the child components of a component. It allows components to render their child components directly, without having to pass them down through props. The children prop can be used with any component, including functional components.

Redux state functions are called reducers because they take the current state of the application and an action as input, and return a new state as output. This process of reducing the state of the application is the core principle of Redux.

Shallow Renderer is a tool for simulating component rendering without deep rendering. It can be used for testing components in isolation and allows developers to easily check the output of a component's render method.