Editing means correcting and refining grammar, punctuation, and mechanics. Proofreading means taking a final look to check correctness and to catch spelling or word-processing errors. Don’t edit and proofread too soon. As you draft, don’t fret over spelling an unfamiliar word; it may be revised out in a later version. Wait until you have revised to refine and correct. In college, good editing and proofreading can make the difference between a C and an A. On the job, it may help you get promoted. Readers, teachers, and bosses like careful writers who take time to edit and proofread.