Getting Started problem. Not sure where to go from here

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I follow instruction. After I login, the instruction is to do sudo…
But the command was not understand. I logon as root. I also could not find any instruction on how to get the Encryption keys. I got the add on from the GUI, DuckDNS, lets encrypt but no instruction on where to get the key. Help need to get start.

Root does not require sudo.
Just leave it off command