It's pretty simple. Normally on your turn you have a move and an action. Some things, like the Rogue's Cunning Action, give you a bonus action, but you can only have one per turn.This. I'm trying to wrap my head around the bonus actions but I struggle. It's kinda like 4E's minor action, but not really?
Somebody explain how this works for me please, even though it's probably painfully obvious.
It's like a minor action, except you can only take it if something specifically says you can.