text: Well, if you hit a home run, it depends on how many people are already on base.  The highest you can get is a grand slam, which is four runs.  That's because there's a person on first, second, and third, and then there's the batter, which makes the fourth.  You can score by being batted in.  If there's a player on third and a batter hits a single, making it to first base, then most likely the runner on third will make it home to score one.\n\n\n~~~Edit~~~\nSo it doesn't necessarily have to be a home run.  It can be a single, double, triple (how many bases the batter can run without getting out) or even a sacfly (which is a sacrifice fly out-ball goes in air and is caught by a fielder, but still scores someone).  Runners can run even if the ball is out if there is one or less outs...2 outs means that the batter can be third out and end the inning, so nobody can run.\n\nHope this helps!