How many balls result in a walk?

Which team plays at Rate Field (formerly Guaranteed Rate Field)? Which team plays at Oracle Park? How many innings are in a regulation MLB game? How many strikes make a strikeout? How many outs does each team get per half-inning? How far apart are the bases on an MLB diamond? What is the distance from the pitcher's rubber to home plate in MLB? How many players are on the field for the defensive team?