How to LOGIN as root on my Ubuntu Server

[Habitual]

https://www.digitalocean.com/communi...on-a-linux-vps

Strong ssh-key generation:

ssh-keygen -f /path/to/keyfile_rsa -t rsa -N '' -b 4096 -q

Basic usage:

ssh -i /path/to/keyfile_rsa <user>@host

wrt: /etc/ssh/sshd_config
and

PermitRootLogin yes
PasswordAuthentication yes

is just wrong, Wrong, Wrong on public-facing servers.

In a controlled environment like Virtualbox, meh, have to practice somewhere. Right?

Very Important distinction.