The document describes basic HTML tags including structural tags like <HTML> and <BODY> that enclose the entire page. It also covers header tags (<H1>-<H6>) that are used to mark sections, paragraph tags (<P>), line breaks (<BR>), horizontal rules (<HR>), font tags (<FONT>), and list tags (<UL>, <OL>, <LI>) for unordered and ordered lists. Links are created using the <A> anchor tag along with the HREF attribute.