15 Query Letter and Submission Mistakes To Avoid, taught by Brandy Vallance. Once you understand some basics about crafting a query and submitting your work, it’s time to review what NOT to do when contacting agents and editors. This class, taught by a literary agent, addresses common agent pet peeves, submission errors, things that come off as unprofessional, cliche wording in a query, and more. Learn what small mistakes may be torpedoing your submission, and what you can do to fix them.