Font Tags
Font tags are used in a variaty of ways. They may be used to place color on words, change the font family, or even the font size.
The most common use of the <font> tag is to change the color of words. This is also quite easy to do and easy to get a hang of.
Font Color
To change the font color use: <font color="#000000"> where #000000 is the name or hexidecimal of the color you wish to use (Be sure to close the tag off using a </font> after you type the word/letter you wish to change!.) A list of colors is listed at the background section of this site.
Font Family
To change the font family, simply write <face="family name">. Here is an example: <font face="Times, Times New Roman, Courier"> ending with </font>.
Font Size
As for the font size, it is based on relative sizing. For example, 1 is the smallest, 2 is the next smallest and so on. To use fontsize: <font size="3"> and again ending with </font>.
However, you may also use pointsize. To do this, instead of using size="3" use pointsize="10".
As a warning however, points show up differently depending on the browser/OS/screen resolution. So your best bet is to use relative size if you are using strictly HTML. Although, you may use CSS to strengthen your HTML. In this case, you may use ems, points or pixels for the sizing of your text.