Many brilliant people have some communication weak spots. Unfortunately, the reality is that written communication is a big part of business, and how you write reflects on you. Poor spelling and grammar can destroy a professional image in an instant.Even if your job doesn't require much business writing, you'll still have emails to send and notes to write. And if you're looking for a job, your cover letters and resumes will likely mean the difference between getting the interview or not.Bad grammar and spelling make a bad impression. Don't let yourself lose an opportunity over a simple spelling or grammar...