Leading-off Second So you know how in baseball, before you steal a base, you take a good solid lead-off? The three bases and the place where the batter is standing while hitting the ball home plate make for a rhomboid see the picture , and the claiming is done by touching the bases which are represented by white squares. What do they mean? What is Third Base Also more ambiguous than the first base, the question what is 3rd base depends on how cool you are, so for you, it might be holding hands. Like in baseball, the first base is a good place to build upon. BACK to the home run. And also, this is too adult for you, leave.