Clients often ask me to look at cover letters. In most cases, the problem is the same: Too much detail that repeats what is in the resume. A cover letter is a business document that introduces whatever it is sent with. For example, a cover letter sent by a bill collector would tell you that you have to pay a bill. A marketing cover letter would tell you why you should read a pamphlet or other brochure that is enclosed or attached.
If you’re looking for work, a cover letter should introduce your resume. Keep it short and touch on key selling points that the employer is looking for. I also like to include soft skills that are often hard to convey on a resume. For example, a cover letter is a good place to talk about being self-motivated, paying attention to detail, or describing your personality or work ethic.
If it’s true that employers scan resumes in a few seconds, why are they going to take the time to read a thick cover letter?