Redux is a library used for front end development. It is a state container for JavaScript applications which should be used for the applications state management. You can test and run an application developed with Redux in different environments.

No. It uses JSX, which is similar to HTML.

Error boundaries help you to catch JavaScript error anywhere in the child components. They are most used to log the error and show a fallback UI.

Pure components are the fastest components which can replace any component with the only a render(). It helps you to enhance the simplicity of the code and performance of the application.

React Router is a routing library which allows you to add new screen flows to your application, and it also keeps URL in sync with what's being shown on the page.

Strict Mode allows you to run checks and warnings for react components. It runs only on development build. It helps you to highlight the issues without rendering any visible UI.

Synthetic event is a kind of object which acts as a cross-browser wrapper around the browser's native event. It also helps us to combine the behaviors of various browser into signal API.

A presentational part is a segment which allows you to renders HTML. The segment's capacity is presentational in markup.

A higher-order component also shortly known as HOC is an advanced technique for reusing component logic. It is not a part of the React API, but they are a pattern which emerges from React's compositional nature.

Stateless components are pure functions that render DOM-based solely on the properties provided to them.

Keys allow you to provide each list element with a stable identity. The keys should be unique.

The arrow function helps you to predict the behavior of bugs when passed as a callback. Therefore, it prevents bug caused by this all together.