Q.Can my boston ferns hang outside
I purchased three Boston fern plants today. I am a beginner. They are hanging plants.

To start your experience with Boston ferns, here is some basic information: https://www.gardeningknowhow.com/houseplants/boston-fern/boston-fern-care.htm
You can hang them outside, in a partly shaded place. A shaded patio or porch is perfect. You will need to bring them inside for the winter, when the temperature goes below 40degrees. This article will tell you more: https://www.gardeningknowhow.com/houseplants/boston-fern/overwintering-boston-ferns.htm
You'll save yourself a lot of trouble if you place your ferns and the pots you purchased them in, into nice waterproof hanging baskets. You won't have mess from water dripping, and they'll stay moist easily.