Today’s digital cameras already have all the resolution you will ever need, so don’t have to consider image resolution nearly as much as you once had to. You can easily get a digital camera that meets the basic resolution requirements, which is somewhere around 6 megapixels for most printing and viewing. You only need to consider a beefier camera if you always need to create larger poster-sized prints.
Also, because most memory cards store tons and tons of images, you should never feel the need to conserve space. Go ahead and snap those pictures at full resolution and don’t modify the resolution settings later on. Doing absolutely nothing is the best way to ensure great quality so far as image resolution is concerned.