HTML Reference Sheet
The HTML Reference sheet contains lists of HTML tags, tutorials, attributes, and other things of such. Don't know HTML? Just browse through this section and you'll have an understanding in no time!
HTML Version Information

A valid HTML document declares what version of HTML is used in the document. The document type declaration names the document type definition (DTD) in use for the document.
The HTML Element

After the document type declaration, the remainder of an HTML document is contained by the HTML element.
The Document HEAD

The HEAD element contains information about the current document, such as its title, keywords that may be used for search engines and other data that is not considered document content.
The Document BODY

The body of a document contains the document's content. The content may be presented by a browser in a variety of ways.
Language Information

This portion of the reference discusses two important issues that affect the internationalization of HTML: specifying the language and direction of text in a document.
Text & Text Formatting

The following sections discuss issues surrounding the structuring of text. Elements that present text (alignment elements, font elements, style sheets, etc.) are discussed elsewhere in the specification. For information about characters, please consult the section on the document character set.
List Elements

HTML offers authors several mechanisms for specifying lists of information. All lists must contain one or more list elements.
Using Tables

The HTML table model allows authors to arrange data -- text, preformatted text, images, links, forms, form fields, other tables, etc. -- into rows and columns of cells.
Links & Anchors

HTML offers many of the conventional publishing idioms for rich text and structured documents, but what separates it from most other markup languages is its features for hypertext and interactive documents. This section introduces the link (or hyperlink, or Web link), the basic hypertext construct. A link is a connection from one Web resource to another. Although a simple concept, the link has been one of the primary forces driving the success of the Web.
Objects, Images, Applets

HTML's multimedia features allow authors to include images, applets (programs that are automatically downloaded and run on the user's machine), video clips, and other HTML documents in their pages.
Style Sheets

Style sheets represent a major breakthrough for Web page designers, expanding their ability to improve the appearance of their pages.
Using Frames

HTML frames allow authors to present documents in multiple views, which may be independent windows or subwindows. Multiple views offer designers a way to keep certain information visible, while other views are scrolled or replaced.
Using Forms

An HTML form is a section of a document containing normal content, markup, special elements called controls, and labels on those controls. Users generally "complete" a form by modifying its controls, before submitting the form to an agent for processing.
Using Scripts

A client-side script is a program that may accompany an HTML document or be embedded directly in it. The program executes on the client's machine when the document loads, or at some other time such as when a link is activated. HTML's support for scripts is independent of the scripting language.
HTML Tag List

Here you can find a complete HTML Tag list explaining all attributes of each tag and some real world samples.