You can bet your boots on that.
Don't worry about that.
Don't worry about that.
Don't worry about such a thing.
Oh, don't worry about that.
Don't worry about that.
そう心配しなさんな.
Don't get so worried.=Don't worry so.
You don't need to worry about such a thing.
You don't need to worry about such a thing.
Don't worry about him.
その件は気にしないでください。
Please don't worry about that matter.
Don’t worry.
Don't worry yourself about that.
You don't have to be so nervous.