Below are each of my Animal Crossing islands, with lists of who lived there, the theme, when I created it, as well as all of the codes I used and what mods I used if applicable!
Islands are listed in order of when I started them, so my newest islands will be at the bottom.
I have a Pinterest board where I save all of the codes that I use, so you can repin them if that is your preferred method of saving codes! See it here.
I also have a general Animal Crossing board where I save codes that I think are cute but have not necessarily used. See it here.