Don't count your chickens before they hatch
don't celebrate victory before it is declared.
Bury the hatchet is an example of
idiom
Suggest an idiom or proverb for the idea that it is not necessary that a thing might turn out as per it's external appearance
All that glitters is not gold.
what is the idea behind the idiom "Elephant in the room"
It means major problem which is being avoided
what are proverbs?
proverbs are popular saying with moral ideas.