You steal a base by running for it before the pitcher even pitches, instead of waiting for the batter to hit the ball.
If the pitcher sees you, instead of pitching to the batter the pitcher must throw the ball to a team mate who must tag you out before you reach the base safely. You can choose to return to the base you started on, but to steal the base you must arrive safely on home.
steal of home
Ricky Henderson stole all the bases and home plate ...
Wait for the pitcher to throw the ball home then run for the next base.
Jacki Robinson
No, you cannot steal a base on a foul tip.
No, you cannot steal a base on a strike in baseball.
No, you cannot steal a base when the pitcher has the ball.
No, you cannot steal first base in baseball.
To get closer to home plate, and therefore closer to earning a point.
You can't steal first in any league. You can only steal once reaching base.
No, you cannot steal a base on a foul ball in baseball.
It makes no difference, they can go as far as they want to.