RBI
A single is a hit that allows the batter to reach first base safely.
A single is a hit that allows the batter to get to first base.
The error stands as the batter reached a base safely.
Ty Cobb, Detroit Tigers
It's called a triple.
Every run produced must have a runner reach first base.
They can reach 1st base via walk, error, hit by pitch or fielder's choice.
A sacrifice bunt.
You can score from second base several ways. First, you can score on a single if it is hit far enough. You can also score on an error. You can steal third and make it home on a bunt or a hit. You can reach home from second base with a sacrifice hit, or an extra base hit by the batter.
As many as possible, but the record is 11.
He can either get thrown 4 balls or if he swings and misses the 3rd strike and the catcher drops it, he can run to the base. Other ways: Error by a fielder allows the batter to reach first. Fielder's choice, less than two outs. Fielder obstruction after batted ball. None of the above are counted as hits, but the batter still ends up on base. Batter hit by pitched ball. Catcher interferes with batter's swing (I've not only never seen this, I've not aware that it has ever been called in the last 75 years or so).
There are several ways to reach first base, but the 5 ways to be awarded first base, without putting the ball into play: 1. Hit-by-pitch 2. Base on Balls 3. Intentional Walk 4. Dropped 3rd strike 5. Catcher interference (hitting catchers glove while swinging)