You either had anger issues as a kid or you simply spent years throwing stuff. You get the following:

Ability Score Increase. Increase your Strength or Dexterity score by 1, to a maximum of 20.  

Multithrow.  When you throw a weapon, you can make two additional throw attacks as a bonus action

Quick Hands. You can spend a bonus action to retrieve stow or wield all thrown weapons within 5 ft of you. 

Returning. Thrown weapons also have the returning property.  They return to your hand after you throw.