Identify people, events, and dates.
Use black and white photos because the process is more stable and will outlive color photos by many years. Color photos will fade.
Store photos away from light and placed in plastic or paper protective covers. Light may cause fading and brittleness. Gritty dirt and dust will be abrasive to photo surfaces.
Store negatives separate from prints when possible.
Place photos in a commercial archival-quality album.
Touch a photograph anywhere but the edges. Skin oil will damage any part of the emulsion that you touch.
Use tape to attach the pictures to a sheet.
Use paper clips, rubber bands, or other kinds of fasteners on pictures.
Use highly colored paper, magnetic or "no stick" albums. These will deteriorate rapidly.
For more information on caring for photographic collections, visit the Library of Congress.