What's "for nothing" mean? Is it commonly used?

Native speaker’s answer
Rebecca
"For nothing" means without payment or with no cost. And it can also mean to no purpose or pointlessly. It's pretty commonly used, yes! Ex: I got this shirt for, like, nothing. It was so cheap. Ex: I don't wanna travel two hours for nothing. We have to make the trip fun and worthwhile. Ex: I told them I'd paint the room for nothing.