I just use lard on my face and sometimes on my body when I sunbathe.
The sun dries out your skin, so you should moisturize your face.
If you are very white, you'll also have to use it on your body at least the first few times you sunbathe.
You can also use lard as a day-to-day moisturizer for your face if it gets dry.
I don't have access to tallow where I live, so I only use lard.
I buy lard at the local grocery store, but they also sell it at farmers markets and butcher shops.
You can also use lard/tallow/butter, etc when showering if your skin dries out a lot from the hot water.