Typography - What principles of typography need to be considered when using text software?

What principles of typography need to be considered when using text software?

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Could you be more specific? At the moment it just sounds like you want us to do your homework for you.
Tough question to explain, however here is the answer: Principles of Typography: Type Size - Type is measured by its vertical height, in points. There are approximately 72 points in an inch, so 72-point type is approximately 1 inch in height on a printed page. 36-point type is approximately ½ inch in height, and 18-point type is approximately ¼ inch in height. Text on a printed page is usually 10 -12 points in size. Any type below 9 points in size is very hard to read. Weight - Weight refers to the density of letters, the lightness or heaviness of the strokes in a typeface. It is described as a continuum: light, regular, book, demi, bold, heavy, black, and extra bold. These weight descriptions are used in font names to describe the thickness of their lines. Light fonts are composed of the thinnest lines and extra bold fonts are composed of the thickest lines. Not all weights are available for all typefaces and the continuum occasionally varies in some typefaces. Style - Style refers to options such as bold, italic, underline, and reverse, that you can choose as part of your type specifications. Leading - Leading is the vertical space between lines of type. It is measured in points and is expressed as the sum of the type size and the space between the two lines. Generally, it is at least the size of the type. Type with a generous amount of space between lines is said to have open leading and type with relatively little space between lines is said to have tight leading. Some software programs, including all desktop publishing programs, allow users to adjust leading. Alignment - Alignment refers to the shape of the text block in relation to the margins. Most software programs allow left alignment (sometimes called flush left), right alignment (sometimes called flush right), center alignment, justified alignment, and force justify alignment. The Color of Type - Even when printed in black and white, all type has a color on the page. Color here means the overall tone or texture of the type and the lightness or darkness that varies among typefaces and spacing of type.