W3 Schools: free web building tutorials

Full Web Building Tutorials – All Free
At W3Schools you will find all the Web-building tutorials you need, from basic HTML and XHTML to advanced XML, SQL, Database, Multimedia and WAP. There are full references covering all Web-building technologies, including W3C standards like HTML, XHTML, CSS, XML and other technologies like JavaScript, PHP, ASP, SQL and much more. There are also thousands of cut-and-paste examples allowing you to edit and experiment with the code on-line.