Tack sharp photos are the mark of a skilled photographer. Notwithstanding the use of special effects, such as creative blur, zoom blur, or manipulated depth of field, a sharp photo is a better photo every time, especially if you intend to produce a print. Modern cameras are so advanced that solid focus is all but guaranteed in auto modes. Nonetheless, study the focal controls in all modes for maximum sharpness. When natural conditions like low light, moving subjects, and multiple focal points try to confuse the camera's auto-focus, you'll need to understand how to compensate.