Webs can be a powerful ingredient in magick such as for binding spells, be it a spider's web you find outside or a cobweb in a corner. They also were used in folk medicine for healing, especially to staunch bleeding. When collecting your webs, never harm a spider and never take a web when a spider is on it.
…a pair of witches coming nigh,
A spider was just the thing they needed
to ensure their bubbling brew succeeded.
They plucked the spider, web and all
from the window in the wall,
then stirred her in with some molasses.
from “The Spider’s Curse”
by Paula T. Calhoun
Blessings dark and deep!