How do I change the size and face of text?

One 'face' is bold, what is the other one? Normal?

Please let me know. Thanks a lot.
Microsoft uses the following terminology:

Font (the general appearance of the strokes of text, plain or elaborate, and the spacing of letters)

Font Style (Regular, Bold, Italic)

Font Size - measured in points.

If you want a detailed disccussion on font design see "typeface ".
Thanks a lot for the information.