If I’ve said it once, I’ve said it a thousand times: proofread everything you put out. If you’re going to proofread your resume, you should definitely proofread your cover letter. It’s particularly beneficial to have a friend or associate read your cover letter, because they will be able to tell you if it’s engaging, clear and informative. Don’t be offended by any feedback because all feedback is helpful, especially when it comes to looking for a job. Be open to making some changes, because it could be those changes that get you an interview!