Answer:
When one does not know what it is, then it is somethingอพ but when one knows what it is, then it is nothing.
I am used in most sports, have four holes, come in many different colors and there is a state that shares my name.
It is a place of play on a sunny day. Winter will come and take all the fun, but we'll be back in May. What is it?
Children keep their assets in this.
What asks no questions but requires many answers?
I can only be played on a windy day