Disable ROOT login for VPS

Login to you VPS via ssh
$ ssh root@SERVER_IP_ADDRESS

Add new user
$ sudo adduser username

Add user to sudo group
$ sudo adduser username sudo

Change ssh config
$ sudo vim /etc/ssh/sshd_config

Change lines
PermitRootLogin yes -> PermitRootLogin no
Port 22 -> Port ????

And for last step restart ssh service
$ sudo service ssh restart