Add or subtract one and look at effects. HEAD opens the Heading at the top. BODY is the Text of the webpage, or visible Body of content. Go visit later a little freeware called HUEY . It creates cool colors and hexadecimals instantly, easily etc.
HR is the light line across the page above.
UL is an unordered list and has bullets and no numbers. Return To Top is an underlined link to click. Simplicity is important if you're trying to reach everyone in the world. Max-Out your webbie if you're trying to impress your webmaster boss. This gets complicated quick.