XHTML Tutorial -  .

Bejoy Alex Jaison: Converting HTML documents to XHTML - - Short page presenting some introductory guidelines.

Computer Torture - - Lists of brief guidelines for XHTML and for XHTML-Basic. [Author and qualifications are not identified..

Gowansnet: XHTML Tutorial - - 3 parts: introduction; tags; attributes. The introduction includes the main changes from HTML, the doctype, and document formation.

HTML | XHTML articles and tutorials: A List Apart - - A List Apart has many useful articles showing what cane be done with XHTML. Contains step-by-step instructions and tutorials.

Joe Burns: XHTML - - Short page introducing the relationships between XHTML and HTML.

Onaicul: XHTML Design Guide - - 5 parts: introduction (including an historical perspective on hypertext); modularity; document specs; code guidelines; design guidelines; appendices with resources. Each part contains subsections.

Ross Shannon: XHTML Explained - - Short page explaining what XHTML is, describing the benefits of XHTML, and providing some guidelines for coding.

Simon Jessey: Learning XHTML - - 5 parts including: page structure; lists; hyperlinks and text formatting; tables; and forms. Suitable for beginners, without prior knowledge of HTML.

Third Millennium (ThirdM): XHTML for HTML Users - - Short page presenting some introductory rules.

Web Developer's Virtual Library (WDVL): Introduction to XHTML - - 5 parts: introduction; XML and XHTML; document type definitions; differences from HTML; and document structure.

World Wide Web Consortium (w3c): XHTML Modularization - - 7 sections: introduction; terminology; module construction; DTD construction; module examples; mark-up language examples; usage examples.

Xguru: XHTML Tutorial - - 8 parts: introduction (including doctype and namespace, as well as the differences from HTML); XHTML Basic; XHTML Basic example; modularization; timelines (a chronology of the HTML and XHTML specifications); questions and answers (frequently asked questions).