Home garden training in winter camping is a good idea. Winter camping away from home requires proper equipment, and extensive training and safety measures.
For example informing friends at home, where you will be at what time. And informing these friends, when and how they should call in a search & rescue mission.
Video: How to stay warm in a tent in the snowhttps://www.youtube.com/watch?v=uOX5SCV7x50