For the beginners:
before applying any makeup make sure you use
Apply before adding foundation and eyeshadow.
The face and eye primers are separate.
if you dont have a face primer then just apply lotion before you apply your makeup, although it might not give you the same results as with an actual primer.
The point of an eyeshadow base is too make it last longer, obtain more vibrant color and prevent creasing.
here are a few options
Urban Decay primer potion, MAC's paint pots, and Too Faced Shadow Insurance are my most favorite.
Drugstore brand: Loreal decrease is the best drugstore option.