Photo organization from Mac to External Hard Disk
I recently got the Mac Air laptop and noticed that the iPhotos can organize my photos by location, date, etc. I really like it and would love to get all my photos organized in a folder like that. I also really like the Faces feature because I can assign name tags to faces and then view just a single person if I want. How do I do this for all my photos which exceed the amount of my Mac Air hard disk space.
MacBook Air, OS X Yosemite (10.10.5)