The useEffect hook in React is used for side effects in functional components, such as data fetching, subscriptions, or manually changing the DOM.

React Router is a library that enables navigation among views in a React application, allowing for the development of single-page applications.

setState is used to update the state of a component and trigger a re-render.

Lifting state up is a pattern where the state of a child component is moved to its parent component, allowing multiple child components to share the same state.

State is internal to a component and can be changed over time, while props are external and passed to a component.

State is an internal data store that belongs to a specific component, and it can be changed over time. Props are properties passed to a component from its parent, and they are immutable.

Keys are used to uniquely identify and differentiate between components in React. They help React identify which items have changed, added, or removed.

The virtual DOM is a lightweight copy of the actual DOM in memory. React uses it to improve performance by updating only the changed parts of the actual DOM.

JSX (JavaScript XML) is a syntax extension for JavaScript recommended by React for describing what the UI should look like.

React is an open-source JavaScript library for building user interfaces or UI components, developed by Facebook.

CSS display property used to align the elements in the web page. Like align the elements horizontally and vertically using display property values.

Basically CSS position property used to place/positioned an element on the web page. It uses top, left, right and bottom values to position an element.

Before start any development, we used to work on the planning. What technology we can choose to develop a web application, how feasible for us to use that technology, what is the global community size, how often we get the support from the global community, what is the current status of the development and their future plan,etc. Like that we use to consider many factors before we consider any technology for our web application development.

Drupal is a open source powerful content management system in PHP. It has many in build features to develop a website with minimal effort. It's adding new features day by day. We can customize the application as per our requirement with the build-in components as we as custom components by extending the core components.