Configuration files and/or changes to default config files in /etc/

Setup timesyncd for NTP syncing (using systemd, not ntp package)
- set to use global pool.ntp.org, you should change this!
- verify timesyncd is working with 'timedatectl' command
Setup nano with helpful configurations both locally and via SSH
- rebind number lock
- constant show cursor position at bottom of screen
- constant show line numbers on the left
- added shortcuts for cut, copy, paste using alt-x,c,v respectively
- enable multi-buffer for concurrent open files
- cut to end-of-line
- bracket and quote matching
- tabs converted to spaces, tab = 4 spaces
- activate default colourization
Colourize prompt
- red username for root user or shell accessed as root (su, sudo -s, etc.)
- green username for regular users
- display time and full path
Setup SSH server
- use non-standard port 222
- use host-keys (RSA and ED25519 - you need to generate these!)
- display a banner on sucessful connection
- do not allow root login
- require keyfile authentication (disable password authentication)