What is a "perfect game"?

In scorekeeping, what number is assigned to the shortstop? In scorekeeping, what number is assigned to the catcher? What does a "6-4-3 double play" mean? What is it called when a pitcher allows no hits in a complete game? What is it called when the fielding team records three outs on a single play? What is a "Texas Leaguer"? What does "can of corn" mean in baseball slang? What is a "golden sombrero" in baseball slang?