Your cover letter will be the first document that a potential employer will see. It sets the stage for the reader to review your resume.Identifies the position for which you are applying and how you learned of it. b. Indicates why you are applying. c. The first portion of the cover letter is an introduction. A cover letter usually is three paragraphs long and outlines why you are applying for a specific position, a brief overview of your professional background. Learn how to prepare a dynamic resume and cover letter to set you on the right track to getting your dream job. Find resources and information on applying for job openings in Allegheny County, including disability accommodations, rehires, and application FAQs. Learn how to write effective resumes and cover letters, view sample resumes and cover letters, and get tips for completing job applications.