7. Use colour well
Color evokes feelings. Color is emotional. The right color can help persuade and motivate. Studies show that color usage can increase interest and improve learning comprehension and retention.
You do not need to be an expert in color theory, but it's good for business professionals to know at least a bit on the subject. Colors can be divided into two general categories: cool (such as blue and green) and warm (such as orange and red). Cool colors work best for backgrounds, as they appear to recede away from us into the background. Warm colors generally work best for objects in the foreground (such as text) because they appear to be coming at us. It is no surprise, then, that the most ubiquitous PowerPoint slide color scheme includes a blue background with yellow text. You do not need to feel compelled to use this color scheme, although you may choose to use a variation of those colors.
If you will be presenting in a dark room (such as a large hall), a dark background (dark blue, gray, etc.) with white or light text will work fine. But if you plan to keep most of the lights on (which is highly advisable), a white background with black or dark text works much better. In rooms with a good deal of ambient light, a screen image with a dark background and light text tends to washout, but dark text on a light background will maintain its visual intensity a bit better