Visist Learn Basic HTML (1) to download your copy.

An excerpt from the book:

– Chapter 1–
What is HTML?
HTML stands for “Hyper Text Mark-up Language”.  HTML is the bricks and mortar of the WWW. Without HTML the World Wide Web could not have become as important as it is today.  HTML is a document formatting language common the all computers on the WWW. html permits cross platform communication between Macs, Apples, SUNs, PCs and others to view a document in a similar
way.