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

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

Short page introducing the relationships between XHTML and HTML.

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

5 parts: introduction; XML and XHTML; document type definitions; differences from HTML; and document structure.

7 sections: introduction; terminology; module construction; DTD construction; module examples; mark-up language examples; usage examples.

Tutorial explaining what XHTML is, describing its benefits, and providing some guidelines for coding.

A collection of help, guidance and tips to assist with web authoring.

8 pages, including introduction, differences from HTML, syntax, DTD, examples, validation, and a quiz. Also, reference pages provide lists of tags and attributes.