Wallpaper/Home Screen
@Heidixje
I figured out how to have a different photo on your home screen and your lock screen if you're still looking for that answer. Start as you would to change your wallpaper (Settings, Wallpaper) Then, you can add a new Wallpaper (stick with me). Once you have your lock screen and your home screen side by side on your screen, each will have a customize button at the bottom. Click that for your home screen and then instead of clicking "Pair" at the bottom, you'll click photo. This way I can have my husband on my home screen too and not just my dog on both screens - because we know which one gets more screen time! :)
Hopefully that helps :)
iPhone 11