How do I make save slots?

I want to make save slots like this

but ı dont know how to make it, please help me.

Here is a demo which you may be able to modify for your needs:

howtoconstructdemos.com/saving-and-loading-system-with-multiple-save-slots

thanks dop2000. Its pretty good example.

I'm going to make a save state as in this example Platformer engine - youtube.com/watch

However I don't know if I will succeed or if it's really complicated;)