Once I Buy an Expired Domain, Then What?

Hi all. I'm struggling to find information on what to do with a domain once I purchase it. It seems like buying expired domains is a "thing", but wouldn't you have to then maintain it and grow it just like any other site?

I've heard of people buying multiples. How in the world do they have the time to take care of client work AND maintain all their sites?

Curious.
Cheers!
Barb

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