You have looked at the use of letter forms to represent words and by now have had some experience of drawing them to create different visual effects. When you are preparing a layout using words, you will, in fact, need to be familiar with the typefaces that are available.
Typefaces are the different styles of letters as they are printed. It is essential that the typeface chosen for, say, a heading be consistent throughout that heading and that the typeface chosen for a piece of body copy also be consistent throughout. Usually you will choose a typeface by looking at a whole alphabet of letters in the same typeface, so that you can see for yourself the style and image created by each individual letter as it appears in that typeface.

There is an enormous range of typeface styles available to you, giving you tremendous creative freedom to express your ideas. Although you need to be consistent with the style of typefaces you use, you will often find that one style of face has many different weights. You may even find that there are also condensed or expanded versions of the same face. For example, a popular typeface known as Helvetica comes in an enormous choice and range of weights, sizes, and variations.
The other point I have not yet covered and which you must consider is the use of capitals, known as upper case letters, in conjunction with the small letters, known as lower case. Naturally, when you draw a line of type for your heading you will draw to the height of the capitals. Assuming that the heading will be in upper and lower case, you should also draw in the line for the placing of the lower case letters.

You are now ready to select a typeface. Lightly draw your parallel lines for upper and lower case letters, and imitate visually with selected letters the typeface you have chosen. When you are confident with this procedure you can then test it in the design area. Look very carefully for the interplay of j letter spacing and the white space of the design area.