You can view HTML source code of any page you can see in a browser usually by selecting 'View-Source' from the toolbar menu or by right clicking on a particular page in a framed site (like this one) and selecting 'View Source'.
<HTML> ... </HTML> starts & ends a HTML page
<HEAD> ... </HEAD> surrounds the header of a web page (doesn't appear in the browser)
<BODY> ... </BODY> surrounds the main text visible to the browser
<B> ... </B> surrounds bold typeface
<I> ... </I> surrounds italic type
<FONT="Arial, helvetica, Sans Serif" size="3"> ... </FONT> surounds text to be given specified attributes
<BR> line break (puts next text on line below)
<BR> on its own forces sunsequent text/ image to the next line
<P> separates Paragraphs (2 line breaks)
<IMG SRC="photos/scooby1.jpg" width="30" HEIGHT="40" ALT="Picture of my dog"> references a doggy photo to be displayed with the dimensions stated in pixels and an alternative text if it doesn't display.
<A HREF="scooby1.htm">About my Dog </A> references another page or document relative to the current page.