Quick Thoughts on Apotropaic Iron

there seems to be a lot of confusion about the apotropaic qualities of iron.
So, let's clear some points up.
Iron is said in folklore to protect against a wide range of spirits and negative magics including [most of] the Good Neighbors and Alfar, Ghosts, Demons, and witches. Iron objects deter the majority of the Other Crowd who are averse to its presence and things like knives, scissors, nails,