There's a variety of goblin known as a redcap who lives in ruined castles on the border between Scotland and England. They're murderous and terrible.

Because of this, other goblins are unsettled by anyone wearing a red cap.

Goblins are afraid of Santa Claus. Their version of Little Red Riding Hood is a horror story.

Goblins like sour things, the same way humans like sweet things. Goblins are known to steal lemons and bottles of vinegar
Goblins naturally live in forests, but some live near humans to scavenge things, the way foxes do. And also because they find humans hilarious.
Goblins are known for being mischievous, but they usually reserve that kind of thing for people who they don't like. They aren't evil or malicious though. This is anti-goblin propaganda, and they won't stand for it.
A goblin which lives in your home is technically known as a hobgoblin. This is because they like to be near the stove, because it's warm and they like the smell of garlic.
@InvaderXan you're playing merry hob with my expectations