Reddit mentions of The Best Team Money Can Buy: The Los Angeles Dodgers' Wild Struggle to Build a Baseball Powerhouse

Depends how much effort you want to put into it.

For general baseball knowledge and history:

• Watch all of Ken Burns Baseball (its all on Youtube).
  
• Read Moneyball for an understanding of how modern analytics revolutionized the game and upended the status quo. (Some people are still fighting this fight, but among MLB front offices the nerds have already "won" basically).
  
• Read Baseball Between the Numbers for a good primer on modern analysis (though there has been more progress since that book came out of course)
  
  
  For Dodgers specific history:
  
  
• Watch the ESPN 30 for 30 on Valenzuela (Fernando Nation).
  
• Read Jon Weisman's book about the Dodgers for a great overview of team history.
  
• Read Molly Knight's book for a good narrative look at the current team and ownership group. This is great context for understanding how we got to where we are now.
  
  For current news and analysis:
  
  
• Dodgers Digest is a great blog for level-headed, intelligent Dodgers analysis. The writers there know what they are talking about and aren't overly reactionary, as a general rule.
  
• True Blue LA, the Dodgers SB Nation blog, is run by Eric Stephen who is the most diligent Dodgers beat writer today. In the off season for example, he's writing a season review for every player who appeared for the Dodgers in 2015.

its not like a book was written about it