Tecadmin published a guide about installing OpenVPN on Debian GNU/Linux 9 or 10.
How To Install OpenVPN on Debian 10/9
A virtual private network (VPN) is a protocol used to add security and privacy to private and public networks. VPNs send traffic between two or more devices on a network in an encrypted tunnel. Once a VPN connection is made, all of the network traffic is encrypted on the client’s end.
How To Install OpenVPN on Debian 10/9