Button collecting is a great hobby. It can be almost anything you want.
Some collectors like to know when their buttons were manufactured.
Some study what they were used for.
Others sort their buttons by where they were made.
Some, by what the design is.
And still others, by what the button is made of.
There are so many ways to look at buttons, it's like a treasure hunt; you just know the prize is just ahead - maybe in that jar of buttons over there.