Tell the reader what it is!
A maddening, and to be honest baffling, mistake I’m seeing at the moment is not putting “CV” at the top of your CV.
You have to tell the reader what they’re reading . It doesn’t really matter if you put Curriculum Vitae (get the spelling right though!) or the abbreviated “CV” but you must put something there to signpost what the document is that they’re about to read.
As with many of the issues that I mention, it may seem trivial but this is the sort of minor detail that can make the difference between an interview and rejection.