Writing about your experience in coding helps you to retain information.

HTML is a content layer which holds the structure of the web website, the pages, and it adds semantics to the content displayed by different browsers.

CSS is the presentation layer which has rules used by classes and selectors to determine how the HTML content will be displayed on different screen sizes.

JavaScript is the behavior layer used to change how different parts of the website will behave, and it adds interactivity to the web pages.