HTML
HTML is THE basic building block of the world wide web. It stands for HyperText Markup Language. HTML is a document-layout and hyperlink specification language. It defines the syntax and placement of special, embedded directions that aren't displayed by the browser, but tell it how to display the contents of the document, including text, images, and other support media. The language also tells you how to make a document interactive through special hypertext links, which connect your document with other documents in yours and others' collections.The most recent HTML version is version 4.0. The World Wide Web Consortium is a collaborative effort by industry, content specialists and experts to make the web more stable, available and interactive. Their site provides the specification of HTML 4.0. The W3C also provides a HTML Validation Service.
Our website also uses Cascading Style Sheets. These style sheets describe how your HTML code should be visualised. If you want to know how CSS works, look at version 1.0 or version 2.0.
The best way to write your own pages is to have a look at how other persons have written theirs. Most browsers support viewing the source code of the page you're looking at.