Q.Boston fern
Do you cut off the tendrils that have no leaves?
These are actually the runners, they can be removed from the plant if you do not wish to divide and propagate the plant.
Here are some links that will help you.
https://www.gardeningknowhow.com/houseplants/boston-fern/boston-fern-runners.htm
https://www.gardeningknowhow.com/houseplants/boston-fern/boston-fern-care.htm
https://www.gardeningknowhow.com/houseplants/boston-fern/boston-fern-turning-brown.htm
https://www.gardeningknowhow.com/houseplants/boston-fern/trimming-boston-ferns.htm