So there's a guide for an earlier version.
https://www.applevis.com/guides/add-widgets-your-desktop-macos-sonoma
Apparently something's different now, but I have no idea what. I've noticed that if I go into system settings/Bluetooth, I can check the battery status of Apple accessories, Magic Keyboard and AIrpods at the moment. Somebody suggested using the batteries widget to get to this info quicker.
So how are we doing this? Do we need to add them to the desktop? If so, how? Is there another way to access them, keyboard shortcut, adding them to a menu, something else? I've never figured out how to get these to work at all. I see there are multiple sizes for some of them, e.g. the battery one, but I have no idea what that does, if it's just visual or if it displays more info in the larger widgets or what.