Local Network .local or .localdomain

So I was watching ZZZ’s YouTube last night. I have my Home Assistant Blue on order but ZZZ has his already (jealous… why couldn’t Frenck send us all one?).

It was mentioned that the system comes with Home Assistant pre installed and it could be discovered on homeassistant.local

I run all Ubiquiti UniFi networking equipment and my domain name is set to .localdomain

This might be a more general networking question rather than specific to Home Assistant but what should this be set to?

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Thanks for any advice!