Have you ever wished you had a friend who was always available, kept all your secrets, never judged you, and helped you understand yourself better? If so, you might enjoy keeping a diary or journal. People write in journals for all sorts of reasons. They might journal to get through stressful times, to document their lives, or as an outlet for their creativity. Or they might just do it because it’s fun. Keeping a journal can also be good for you. Studies show that writing about stressful events can lower your heart rate and reduce feelings of hostility. Other studies suggest that journaling improves your ability to focus. And it doesn’t have to be a fancy leather notebook you write in with a quill pen. Just about anything will work as a journal, even your phone. Here’s how to get started.