Mix Type Styles Carefully Called monotypographic harmony by typographers, it means the most attractive piece is the one with the least amount of mixing of typefaces. Avoid mixing families of type within the same race. When faces are mixed, some means of contrast should be used to separate the two. One for headlines and the other for body copy, for example. Use All-Cap Lines Sparingly.
Lowercase letters are more legible than uppercase.
The ascenders and descenders help us to recognize letter and word forms. Besides, lowercase letters have more character. Use bold, italic or a heavier typeface for emphasis. Limit lines with all caps to two or three and use them with care. Sometimes you will have to tweak the spacing between letters.