Give certificate to server or client (using fly.io)

I am using fly.io. I deployed my code to a URL. However I would like to map my domain to that URL. So, I would like to know several stuff, What does this command do? It should be server or client?

fly certs add requestphotoedit.com --app mycoolapp-server

Is it required? Or only putting A entry as below is enough?

@ 10800 IN ALIAS mycoolapp-client.fly.dev.
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