Basic tags
include HTML, HEAD, TITLE, and BODY. These tags define the structure of an HTML page.
Structure Formatting tags
include EM, STRONG, H1, H2, H3, H4, H5, H6, I, and B. These tags change the look of the page, and, more importantly, give meaning to page items..
Layout tags
include OL, UL, LI, TABLE, TR, and TD. These tags help change how information is presented on the page.