The document provides guidance on improving sentence-level writing skills through addressing various issues such as parallelism, consistent point of view, consistent pronouns, specific word choice, wordiness, and sentence variety. It emphasizes reading writing out loud to identify errors, maintaining the same verb tense, avoiding shifting between first and second person pronouns, using specific rather than general language, and practicing to identify wordy writing. Students are advised to review these concepts and do exercises in their textbook.