Excellent Proofreading and editing skills: Ability to read (printer's proofs or other written or printed material) and mark any errors. Proofreading, on the other hand, is about finding errors both small and large that were either missed or introduced during editing. Proofreaders ensure that the document's final draft is completely free of grammatical errors (e.g., subject–verb agreement problems, incorrect word choices, improper punctuation usage, and incorrect spelling) as well as formatting and typographical errors. They also make sure the document adheres to the chosen style guide.