How do I know the entity id?

Configuration
1

I am trying to be notified when the state changes for a person or entity. But I am not sure how to construct the entity id.

2

nevermind, got it.

3

perhaps write it up here for the next person looking for the answer?

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4

Developer Tools on the frontend has a list of all entities on the States page.

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5

Yes, but where is the entity id in that list?