Q.Boston Fern
All summer my Fern has been green and beautiful. When the weather changed, I brought it inside for the winter and the leaves began to turn brown and die. People I have talked to say this is normal and I should cut it back for the winter, that it will grow back as beautiful as it was. Is this true? If so, how do I cut it back and do I still water and maintain it over the winter, or is it dormant?

Certified GKH Gardening Expert
It is best to continue caring for your Boston fern in a well-lit area and giving it lots of humidity and moisture as usual. It will lose some leaves because of the lower light levels indoors, but will recover next spring.
If you can't keep it as a houseplant, it is possible to let it go "dormant" and keep it in a dark place as described in the following article, but this is not true dormancy and is not as healthy for the plant.
https://www.gardeningknowhow.com/houseplants/boston-fern/overwintering-boston-ferns.htm