How do you put information on the back of a photo?

To put information on the back of a photo, you can use a pen or pencil to write directly on the surface. Include details such as the date, location, names of people in the photo, and any relevant context. If you want to preserve the photo, consider using a small label or adhesive note instead of writing directly on it. Always ensure the ink is non-bleeding and safe for photo materials to avoid damage.