Coherence in writing refers to arranging ideas in a clear, logical way so that readers can easily understand the main points. When writing, authors should consider using different types of organization depending on their topic, such as chronological order for historical events or classification for grouping ideas. Cohesive devices like transitions, pronoun references, and repetition of key ideas help connect sentences and paragraphs to create a smooth flow of ideas. Examples of transitions include words like "before" and "after" for chronology or "similarly" and "however" for comparisons. Pronouns can refer back to nouns to link sentences, and repeating important words and phrases helps readers remember main ideas.