Here are some of the authors favorite links to places to learn about HTML (HyperText Markup Language).
http://info.cern.ch/hypertext/WWW/MarkUp/MarkUp.html
http://arpp1.carleton.ca/machttp/doc/
http://fire.clarkson.edu/doc/html/htut.html
http://home.mcom.com/home/how-to-create-web-services.html
http://www.ncsa.uiuc.edu/SDG/Software/Mosaic/Docs/fill-out-forms/overview.html
http://152.1.24.177/teaching/manuscript/default.html