Proper use of type is crucial in designing effective graphics for video. Often, the text you create will be composited over moving footage, which can make it even more difficult to read. As you design type for video, it is necessary to balance legibility with style, fitting enough information on the screen but not crowding it. If you can combine this functional purpose with a better sense of style and control, you can improve the professional appearance of your designs.
Further Reading on Type
A great book to truly understand type is the oddly named “Stop Stealing Sheep & Find Out How Type Works” (Adobe Press, 2002) by Erik Spiekermann and E.M. Ginger.