React

JavaScript: Familiarity with JavaScript is essential for learning React as it is the primary language used to develop React applications.

HTML and CSS: Knowledge of HTML and CSS is necessary as React helps create user interfaces and web applications that involve these two.

DOM Manipulation: Understanding the Document Object Model (DOM) and how it functions is important as React uses it to update the user interface in real-time.

Git and version control: Understanding Git and version control is vital for managing code and tracking changes in a project.

JSX: JSX is a JavaScript extension used in React to create dynamic user interfaces.

Components: Understanding components is crucial to grasping React as components provide a way to reuse code and make it easier to manage complex projects.

State and Props: Knowing how state and props work is fundamental to React as they enable the components to interact with each other and allow for data to be passed between them.

React Router: React Router is a tool used to manage client-side routing in React applications.

Redux: Redux is a state management tool used in React applications for managing global state.

APIs and web services: Understanding APIs and web services is necessary as they are often used in web development with React.

Node.js: Knowing how to use Node.js is important, as it is often used to set up the development environment for a React application.

NPM: NPM (Node Package Manager) is used to install and manage the dependencies in a React application.

Testing: Understanding testing is valuable, as it enables developers to avoid errors and ensure that the code works correctly.

Accessibility: Accessibility is an essential aspect of web development, and knowing how to make React applications accessible is crucial.

Performance optimization: Knowing how to optimize performance is important as it ensures that the React application remains fast and responsive for the end-user.

React.js: A JavaScript library for building user interfaces. React allows developers to create reusable UI components and efficiently renders changes to the UI in response to updates in state.

React Native: A framework for building native mobile applications using React. With React Native, developers can write code once and use it on multiple platforms, including iOS and Android.

Next.js: A framework for building server-side rendered React applications. With Next.js, developers can create SEO-friendly, scalable web applications that load quickly and provide a great user experience.

Gatsby: A static site generator based on React.js. Gatsby allows developers to use React components to create static web pages that load quickly and are optimized for search engines.

Redux: A library for managing the state of React applications. With Redux, developers can create predictable, testable, and maintainable applications by separating the UI and business logic.

React Router: A routing library for React applications. React Router allows developers to create routes for their applications, making it easy to navigate between pages and components.

React Bootstrap: A set of React components based on the Bootstrap framework. React Bootstrap allows developers to quickly create responsive UIs that look great on all devices.

Material-UI: A set of React components based on Google's Material Design. Material-UI offers a set of customizable, pre-built components that developers can use to create modern, responsive applications.

Relay: A library that provides a way to manage data in React applications. With Relay, developers can fetch and manage data from multiple sources in a declarative and efficient way.

React360: A framework for building VR and AR experiences using React. With React360, developers can create immersive experiences that run in web browsers as well as headsets like Oculus and HTC Vive.