You need to learn to use the documentation. Kivy is an object orientated framework. The documentation tells you what any widget is inherited from, and hide the descriptions to provide a list. Looking at button:
From the image you can see that Button is derived from ButtonBehavior, and Label. You can click on these 2 items to go to the relevant page in the documentation. On the far right of the API there is blue text that says “Hide descriptions” if you click on this, you will get a list.
You will see Label is derived from Widget. Each building up properties.
An id is not a widget property, but is defined in kv language. It puts and identifierinto a dictionary called ids that can be accessed from python to accessed a widget. See: https://kivy.org/doc/stable/api-kivy.lang.html?highlight=lang#ids
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