chief12justice says:
I just submitted a half-elf fighter named Harold. He is a two-weapon fighting specialist. He is a thug, used as muscle by a local thieves' guild to extort people of their goods.
Two- W e a p o n F i g h t i n g
W hen you take the Attack 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 m odifier to the damage of the bonus
attack, unless that modifier is negative.
If either w eapon has the thrown property, you
can throw the weapon, instead of making a melee
attack with it.
I think you can't use a rapier if you want to two weapon fight? Can somone confirm or dispute my thought here?