How does Google find my device work?

I misplaced my phone, which is an LK G4 and used my laptop to use find my device in order to locate my phone. I didn't set the app up on my phone though but it still shows up on find my device. Anyway, I haven't found my phone yet as the map confuses me, as shown here and sometimes my phone shifts directions. So I was wondering, how am I supposed to find my device exactly?

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