Avoid Camera Shake

We've all likely encountered this problem many times: blurry photos due to camera shake with hand-held shots. It's especially prevalent for those of us who are unfortunate enough to have unsteady hands. While it cannot be eliminated entirely, fortunately there's a number of steps you can take to greatly reduce its impact — and hopefully prevent it from becoming visible in the first place.
Blurry Photo from Camera Shake
Photo Without Camera Shake
Photo from the base of the Eiffel Tower at night - Paris, France.
Camera shake is visible whenever your shutter speed is slow compared to the speed of unintended camera motion. Reducing its impact may therefore include:
  1. Methods for increasing the shutter speed (shorter exposure time)
  2. Methods for reducing camera motion
On the one hand, many who are new to photography often don't appreciate the importance of using fast shutter speeds or a tripod, but on the other hand, many experienced photographers often overestimate their impact. More often than not, it is one's shooting technique — not high-end lenses or high megapixel cameras — that ultimately limits the resolution of a photograph.
While either method alone can be of great help, the most effective solution is to take both into consideration. Even the calmest hands cannot hold a camera sufficiently steady during a several second exposure, for example, and fast shutter speeds are unlikely to freeze motion from a telephoto lens held by shaky hands. Also, increasing the shutter speed helps freeze a moving subject, whereas reducing camera motion does not.
There are unfortunately only three ways to increase your shutter speed: (i) optimize your exposure settings, (ii) avoid over-exposure and (iii) improve how your subject is lit.

Choose optimal exposure settings. Make sure you're making the best trade-offs with the camera exposure triangle; are you really using the...