Hi! What code do I use to make a texture unique only to Ginger Island, please if you know?

Hi! If you mean in a content pack for Content Patcher, you can use the LocationContext token. For example:

{
    "Action": "EditImage",
    "Target": "Characters/Abigail",
    "FromFile": "assets/abigail-island.png",
    "When": {
        "LocationContext": "Island"
    }
}

If you have any other questions, come ask in #making-mods on the Stardew Valley Discord and we'll be happy to help! The GitHub issues here are only used to track specific development tasks, so most modders who could help won't see questions here.