Dual Weapon Fighting

You Learned to combo two weapons into a string of attacks, gaining the following benefits: 

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

•  You may gain this benefit only once per turn while holding two light weapons, whenever you make an attack with your main hand weapon you may make an attack with your off-hand weapon. This increases when you gain the "extra attack" class feature you may attack one additional time with your off-hand weapon. This feature can not be used with heavy weapons.

• You don’t add your ability modifier to the damage of attacks made with the off-hand unless that modifier is negative as these attacks count as engaging in two-weapon fighting.

• You can draw or stow two one-handed weapons when you would normally be able to draw or stow only one.

 Examples for clarity:

A Rogue gets one off-hand attack when two-weapon fighting since they do not have the "extra attack" class feature.

A Fighter gets, two off-hand attacks when two-weapon fighting at level 5 due to having the "extra attack" class feature. When a fighter reaches level 11 they still only have two off-hand attacks. 

ONCE PER TURN, you gain this benefit once per turn so you may not action surge or use anything that lets you attack more to get more off-hand attacks. 

you may Still use a Bonus Action for two-weapon fighting as normal. This Feature may not be used with any Heavy weapon period. 

Reminder you do not gain bonus damage modifiers to off-hand attacks.