Hello! Welcome to BYC!! Where are you located? Basic winter care includes having a dry, draft free coop. That will get you a long way! Also, make sure they have a good layer feed to keep their energy up. Once again, welcome to BYC, best of luck!
Hello and welcome to BYC! Glad you joined.
Keep the coop DRY and very well ventilated. Do not attempt to trap heat. Instead look to remove moisture.
Keep drafts strong enough to blow open feathers off roosted birds. Send them to roost with full crops.
Offer electrolytes in a mash on truly bitter mornings. It helps with the stress.
Provide outdoor space sheltered from snow and wind.