强调 (qiáng diào) means to emphasize or stress a point in speech or writing — it's the most direct and common word for this. 注重 (zhù zhòng) means to pay attention to or attach importance to something (e.g., 注重细节 'pay attention to details'), focusing on attitude or behavior. 着重 (zhuó zhòng) is more formal and often used in writing to mean 'put special emphasis on' (e.g., 着重指出 'point out emphatically').