HTML stands for Hyper Text Markup Language. HTML is the standard markup language for creating Web pages. It describes the structure of a Web page. HTML consists of a series of elements.
CSS stands for Cascading Style Sheets. CSS describes how HTML elements are to be displayed on screen, paper, or in other media. CSS saves a lot of work. It can control the layout of multiple web pages all at once.
JavaScript is the world's most popular programming language of web development. It is easy to learn.
Bootstrap is a free front-end framework for faster and easier web development. Bootstrap also gives you the ability to easily create responsive designs.