Buying YouTube Monetized Channels

Sorry for the noob question - but what happens when I buy an already monetized YT channel?

I mean, do I have to re-link my adsense to start earning?
Or I can use seller’s adsense? What about different countries and different modes of payments?

I’m just in the dark about what exactly happens when I buy a YT Channel.

Following this.

bro did u get answer about how to relink adsense ?

To have the earnings go to you, yes.

No. It is linked to their personal credentials. We also do not allow the sale of AdSense accounts or allow them to be included in transactions.