Vanilla is a term used in web development to refer to plain or basic JavaScript code without any external libraries or frameworks. It means that the code is written solely with the use of JavaScript language features, without any external assistance such as jQuery or React. Here is an example of Vanilla JavaScript code that changes the text of an HTML element:

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const element = document.getElementById("myElement");
element.textContent = "New text";

Font Awesome is an open source library which is a good choice for using icons in mobile development as it offers a wide range of icons and scales well for mobile devices. It is also compatible with various UI design frameworks such as Bootstrap, React and Angular.

To make your webpage look responsive, use a combination of HTML, CSS, and JavaScript. You can use @media queries in your CSS code to change styling based on the viewport size. For example:

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@media (max-width: 600px) {
  nav {
    display: none;
  }
}

This code will hide a navigation element from the page when the viewport width is 600px or less. Additionally, you can use frameworks such as Bootstrap or Foundation to quickly implement common responsive designs.

Common node.js interview questions include:

• What is Node.js used for?
• What is the difference between Node.js and JavaScript?
• What is asynchronous programming?
• What are the pros and cons of using an asynchronous programming paradigm?
• What is an event loop?
• What libraries and frameworks have you used in your projects?
• How do you debug a Node.js application?
• How do you unit test a Node.js application?
• How would you secure a Node.js application?
• Describe the most complex project you’ve built with Node.js.
• How do streams work in Node.js?
• What is the responsibility of the incubator in the Node.js process?
• What is callback hell and how can it be avoided?
• What do you need to keep in mind when scaling a Node.js application?

See this Stack Overflow answer for an in-depth look into Node.js interview questions.

React.js and Angular are two popular open-source JavaScript frameworks used for front-end development.

React.js is a JavaScript library created by Facebook for building user interfaces. It uses a component-based structure, which allows developers to break down complex user interfaces into smaller, more manageable pieces. React.js offers more flexibility than traditional Model-View-Controller (MVC) frameworks, allowing developers to create custom components for their projects.

Angular is a full-featured MVC framework from Google. It allows developers to create single page web applications by combining data from a Model layer with components from a View layer. Angular's component-based architechture insulates developers from many of the complexities of modern web programming, allowing them to easily create, update and delete objects.

Both React.js and Angular offer different approaches to web development, and thus are suitable for different use cases. For some projects, React.js might be a better choice due to its flexibility, while Angular could be a better choice in other cases due to its robust architecture. Ultimately, the decision on which framework to use should come down to the project at hand and developers' preferences.

For more information, see the following link: https://developer.telerik.com/topics/web-development/angular-vs-react-which-framework-should-you-choose-your-next-project/