How assign a local domain
https://www.howtogeek.com/167190/how-and-why-to-assign-the-.local-domain-to-your-raspberry-pi/
Markdown Cheatsheet
https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#links
https://www.techcoil.com/blog/how-to-host-multiple-websites-from-home/
https://raspberrytips.com/security-tips-raspberry-pi/
https://raspberrytips.com/mail-server-raspberry-pi/
https://raspberrytips.com/raspberry-pi-firewall/
https://raspberrytips.com/backup-raspberry-pi/
https://betterprogramming.pub/running-ethereum-mainnet-on-raspberry-pi-6aca5cae32aa
https://www.tecmint.com/how-to-install-and-configure-ufw-firewall/
https://phoenixnap.com/kb/configure-firewall-with-ufw-on-ubuntu