usually in negatives or questionsused instead of “something” when saying or asking whether there is one thing or even a small amount of somethingDo you know anything about baseball?
He never does anything to help.
If anything happens, call me.
I promise I won’t do anything stupid.
hardly anything: It was so dark I could hardly see anything at all.
anything else: Do you want anything else to eat?
anything to do/see/say etc.: Is there anything to eat in the house?
what, if anything? (=used when you think there is probably nothing): It is not clear what. if anything, we can do to improve the situation.