Summary

• install Raspbian Buster Lite: dd if=2020-02-13-raspbian-buster-lite.img of=/dev/mmcblk0
• setup minimal configuration: from raspi-config, set locale, keyboard layout, timezone, wifi-country
• update it : apt update && apt upgrade
• secure your RPI: create admin user, remove default pi user, setup ssh
• fix your RPI private @IP: in my case, I do this in the admin section of my router
• buy a domain name from a registrar
• edit your DNS zone from your registrar to add A record that will link your domain name and your router public @IP
• edit your router DMZ section to redirect incoming traffic to your device, here the RPI. You can make use of NAT rules too and port redirections
• extend RPI File system
• install a GITHUB like app, gitea
• get SSL certificates from let's encrypt
• secure it with firewall rules
• setup smtp
• check logs