When you take the action and attack with a light melee weapon that you're holding in one hand, you can use a bonus action to attack with a different light melee weapon that you're holding in the other hand. You don't add your ability modifier to the damage of the bonus attack, unless that modifier is negative.
Two-Weapon Fighting
Action
Action Cost
Required to perform this action
Bonus Action
Description
If either weapon has the thrown property, you can throw the weapon, instead of making a melee attack with it.