Sudo

instead of editing /etc/sudoers, it’s better to add a file in /etc/sudoers.d

if they want sudo access with a password add:

<user> ALL=(ALL) ALL

if you want access without any password prompts:

<user> ALL=(ALL) NOPASSWD: ALL

if you want everybody to have sudo access with their own password prompt:

ALL  ALL=(ALL) ALL

if you want everybody to have sudo access without password prompts:

ALL  ALL=(ALL) NOPASSWD: ALL

The file should be read only to the user and group:

chmod 440 /etc/sudoers.d/<myfile>

on some linux distributions it should be 400 (no group reads).