Certifications can help you get past the software that checks resume adding to your "rating score".

In the real world they don't really prove that much, in the past I've had two people, one right out of school with just about every certification one could think of and one with ten years of practical experience in what we were looking for. The experience won out for us, but it was a fight with HR at the origination I was at over the certifications.

Which ones would depend on the type of work. There are tons of them now, very specialized, and having one not relating to what you are applying for may be seen as a negative for that position.