Hands tend to show how a person lives their life. If they spend time outside working in jobs like carpentry, then they will be a bit rough and tumble. A lot of physical work dries out the skin on hands and can make palms start to crack. Cracking can lead to small cuts and even infection, which nobody wants to deal with, especially if your hands are a part of your livelihood.
After each day, moisturize your hands with Vaseline to create a protective barrier while you sleep peacefully through the night.