With HTML you can create your own Web site. HTML stands for Hyper Text Markup Language. It is used to specify whether your web content should be recognized as a paragraph, list, heading, link, image, multimedia player, form, or one of many other available elements. Since the early days of the web, there have been many versions of HTML: HTML, HTML 2.0, HTML 3.2, HTML 4.01, XHTML and HTML5.
CSS is a simple mechanism for adding style (e.g., fonts, colors, spacing) to Web documents.
PHP is a server-side language with the ability to power everything from personal blogs to hugely popular websites.
JSON is a format for storing and transporting data. JSON is often used when data is sent from a server to a web page.
PayPal is a service that enables you to pay, send money, and accept payments.