A résumé should use a clear, easy-to-read font style. You may wish to highlight certain words or phrases by using bold letters, italics, a larger font size, or "bullets" (except when developing a scannable résumé). Underlining often makes text seem blurry and difficult to read so it should be used sparingly. Do not overuse any highlighting technique or you defeat the purpose of drawing special attention to a few key words or phrases.
Margins and tabs should be used so that the content is centered and comfortably fills a page. Avoid abbreviations (exceptions include GPA and the two-letter state abbreviations) and slashes wherever possible. In addition, indicate dates in simple terms (e.g., "Summer 2001" rather than "June - August 2001" or "6/01 - 8/01").