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When you use 
sudo
, you'll be asked for your user's password for confirmation, and 
then the command will execute. Subsequent commands prefixed with 
sudo
 may not 
prompt for your password, as it will cache your password for a short period of time 
until it times out or the terminal is closed. Understanding this should clarify the 
usefulness of the user account you created during installation. I referred to this user 
as an administrative account earlier, but it's really just a user account that is able to 
utilize 
sudo
.
The intent is that you'll use that account to administer the system, rather than 
root
. 
When you create additional user accounts, they will not have access to 
sudo
 by 
default, unless you explicitly grant it to them.