The "GOLD Patient Guide 2019" explains Chronic Obstructive Pulmonary Disease (COPD), its causes, symptoms, and stages. It provides practical advice for managing COPD, including the importance of quitting smoking, following medical treatment plans, exercising, maintaining a healthy diet, and creating a supportive living environment. The guide emphasizes early diagnosis, regular medical checkups, and strategies for managing severe COPD to improve quality of life.