Reddit mentions of The Crusades: A History: Third Edition

Sure. For a decent overview I recommend The Crusades: A History coupled with The First Crusade and the Idea of Crusading.

You can also read through The Crusades: The Authoritative History of the War for the Holy Land but I didn't find it as informative.

You...don't know much about the Crusades, do you?

Recommended reading:

• The Crusades: A History: Third Edition
  
  
• The First Crusade: "The Chronicle of Fulcher of Chartres" and Other Source Materials (The Middle Ages Series)
  
  
• The Concise History of the Crusades (Critical Issues in World and International History)
  
  
• The Fourth Crusade: The Conquest of Constantinople (Middle Ages)
  
  
• God's Battalions: The Case for the Crusades
  
  Or, if you lack the time, energy, or ability to read, I would recommend watching Crash Course: Crusades by John Green to get started.
  
  You're oversimplifying a complex issue and nearly 700 years of history.