The main difference between night and day creams is that the day creams are lighter than the night ones. The day creams are being absorbed more easily from the skin and are appropriate to be used as a base for the makeup application. Night creams contain more nourishing ingredients and often leave light oily spots on the skin.
Yes it's true that the soap is bad for the skin but nowadays there are many liquid products that are specially designed for the delicate facial skin. They contain essential oils, proteins, collagen and softening ingredients.
You should use different face creams depending on the season. During the summer months use a hydrating cream with a sunscreen with SPF at least 25, during the winter use a nourishing cream with protective ingredients against the cold and the wind with SPF 15 or more.