The five most obvious areas for going digital are: books, music, movies, pictures, and documents (like bills).
Less obvious is digitizing all that junk you’re hanging on to for sentimental reasons. Stuff you don’t really have a use for and that you’ll never display. Stuff that’s hogging up valuable space in closets or even overflowing into your attic or a storage space. If you’ll never do anything with it and it’ll just be thrown away when you die, why not capture the memory so you can enjoy it now and then get rid of the physical item? How do you do that? It’s simple: take a picture and then write down your memories about it.