Passwordless sudo

When executing commands as another user, then sudo is your friend.
Of course, one needs to authenticate correctly. But in day-to-day work it is tedious having to provide the password all the time.
The sudo-command can be made “passwordless” by using a tool called visudo.
Just type
sudo visudo
and your favourite editor will open.
Add the following line at the very bottom (important!)
That allows the user with name to execute commands as root-user.