What is HTML? - HTML is an acronym for Hyper Text Markup Language. It is not a programming language, it is the primary markup language used in the design and building of webpages. Webpages are constructed through the use of a series of markup tags, which are used by web browsers to define the content of each page.
W3Schools HTML Tutorial
W3schools offers free tutorials in all web development technologies.
Tizag HTML Tutorial
Learn the basics of HTML (Hypertext Markup Language).
Getting started with HTML
This is a short introduction to writing HTML by Dave Raggett, revised 24 May 2005.
W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.
Meta Tag Checker
Meta tags check up, search engine submission and optimization services.