How to set up a home VPN server with Wireguard

For a moderately security conscious geek like myself, there can be a number of reasons to want to set up a home VPN server

Accessing your home computer via screen sharing without exposing it to the Internet (and thereby to potential evil-doers)

Accessing county-IP-filtered things like Netflix while travelling

Browsing privately from insecure WiFi networks

Getting access to services that are blocked inside restrictive corporate networks