I'm really interested in learning about the game of baseball, since my grandpa used to be an amateur baseball player. 
I love baseball! It's played with a bat and ball - there's 2 teams each with nine players and they take turns batting and fielding
What's the goal of the team that is batting?
The team that is batting wants to score runs!  The more, the better!  
It sounds like a fun game to watch. Where are these games typically played at?
. One turn batting for each team constitutes an inning. A game is usually composed of nine innings, and the team with the greater number of runs at the end of the game wins. If scores are tied at the end of nine innings, extra innings are usually played. Baseball has no game clock, although most games end in the ninth inning.
Baseball evolved from older bat-and-ball games already being played in England by the mid-18th century. This game was brought by immigrants to North America,
Baseball positions
Baseball is a bat-and-ball game played between two opposing teams who take turns batting and fielding. Within the game there are positions in which each player can play in. 
There are nine fielding positions in baseball. Each position conventionally has an associated number, which is used to score putouts:
1 (pitcher), 2 (catcher), 3 (first baseman), 4 (second baseman), 5 (third baseman), 6 (shortstop), 7 (left fielder