Enable sudoers on Debian 11

vi /etc/sudoers 

add the following text 

root ALL=(ALL:ALL) ALL 

#under this line----- 

newusername ALL=(ALL:ALL) ALL

Debian 11.5

create another file under /etc/sudoers.d/

vi /etc/sudoers.d/mysudoers

add the following text

hubert ALL=(ALL:ALL) ALL