If you ever see my key chain, you will probably be very shocked by the enormous number of keys on it. It looks very similar to this photo. I have so many keys on there, it has become a little ridiculous. I have 3 keys for my house (two for the door, and one for the screen door), two sets of car keys (one for each car), and the garage door key. When I worked a day job, I also had a collection of work keys, which were even less easy to identify.
While I manage to find which key is used for what (most of the time), I find that kids struggle a bit with it. I came up with a few solutions to make it a bit easier. I have used all of them at some point or another and hope you will find them as helpful as I did.