State: draft
Note: This shall serve as a collection of all relevant commands, so that one might save some time searching the world wide web.
USER and OS: Configure your own user and setup daily OS upgrades.
# Change root pw:
passwd
# add personal user
adduser USERNAME
# add user to sudo group
adduser USERNAME sudo
# install unattended upgrades package...
sudo apt-get update
sudo apt-get install unattended-upgrades
# ... and enable
sudo dpkg-reconfigure --priority=low unattended-upgrades
FIREWALL: Install firewall and setup. You may want to change SSH port. Make sure to first allow ssh (so that you will not be excluded from your own server), allow the new port and once connected successfully, deny ssh.