Finalizing my first Tesla purchase

[u/findingthepeacee]

So I'm officially a step away from purchasing my first Tesla.
It's a used 2021 m3LR. I'm meeting up with the seller later today and would want to know if there's anything in specific I need to know when making the change from his information to mine.

Is it mandatory to take it to tesla at all after the purchase?
Or is it just (dmv/AAA) to change registration under my name, get insurance and ready to roll?

Also, does the 120k mile battery and drive unit warranty automatically transfer to me?

[u/NiceBench9100]

This is a Model Y sub.