A good cleanser is exactly what your skin needs to get rid of all the dirt, excess oil, makeup buildup that your makeup wipes didn't get off, etc.
After cleansing the skin, you have to hydrate it and a good moisturizer is how that is done. Be sure to read ingredients so that you aren't putting something on your skin that could make it dry or oily based on your skin type.
Remember that your skin is linked to the health of your body just like everything else. Take good care of it!