If you want to cut limes, you need a sharp knife. A dull knife will crush the lime rather than slicing it, making it harder to get a clean cut. Look for a knife with a serrated edge if possible - this will make cutting through the lime's skin much easier.
Once you have your knife, slice off each end of the lime. Cut the lime in half lengthwise, then slice it into thin wedges. If your lime is particularly large, you may want to quarter it first before cutting it into wedges. And that's all there is to it! Now you're ready to add some fresh lime slices to your favorite recipe.