The main front-end web development languages are HTML, CSS, and JavaScript.

HTML provides the structure and content of a website.

CSS provides styling and presentation of the content.

JavaScript provides interactivity to a website.

HTML and CSS are considered the basics of front-end development, while JavaScript is a more advanced skill. JavaScript is more dynamic and allows for a wider range of functionality, whereas HTML and CSS are more limited in their capabilities.

Choosing which language to use often depends on the specific needs of the project and the developer’s strengths. All three languages are necessary for building a complete website.

The main libraries for front-end web development are:

1. React: A JavaScript library for building user interfaces. It’s efficient, flexible, and widely adopted, making it a popular choice for building modern web applications.
2. Angular: A comprehensive framework for building single-page applications (SPAs). It offers a range of features and tools for building complex and interactive web applications.
3. Vue.js: A lightweight and flexible JavaScript framework for building user interfaces. It offers a similar approach to React but is often considered easier to learn and use.
4. Ember.js: A framework for building ambitious web applications. It offers a large number of features and tools out-of-the-box, making it a popular choice for complex projects.
5. Backbone.js: A minimalistic framework for building web applications. It provides the basic building blocks for building an application, but requires more manual setup and configuration compared to other libraries.
6. Svelte: A JavaScript compiler that generates highly efficient code for building user interfaces. It offers a different approach to building web applications by providing an easier and faster development experience.
7. jQuery is a popular JavaScript library that makes it easier to handle events, create animations, and perform Ajax requests on web pages. It was created to simplify the client-side scripting of HTML and is designed to make it easier to traverse and manipulate HTML documents. jQuery has a large community of developers and is widely used in both personal and commercial projects. It’s known for its concise syntax and ability to handle a wide range of tasks with just a few lines of code.

Each library has its own strengths and weaknesses, and the best choice depends on the specific requirements of the project and the developer’s preferences and skills. For example, React is a good choice for projects that require high performance and scalability, while Vue.js is a good choice for projects that prioritize ease of use and a lightweight codebase.