Use the right typeface.
If you’re updating your resume: avoid the Comic Sans typeface. It looks friendly but is the equivalent of Porky Pig reading the Gettysburg Address. I have worked with the documentary filmmaker Errol Morris, who conducted an online survey and discovered that people are more inclined to believe something printed in Baskerville. It has an amazing refinement and credibility.
So says designer Michael Bierut in this great interview in the WSJ.