Selfhosted
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As you already have dynamic DNS set up, it should be as trivial as forwarding the ssh port (22).
I don't know what the default configuration of Raspbian is, but I would highly recommend generating an ssh key and disabling password login, if you're exposing your box to the internet.
Do not open port 22 to the work OP. That's horrible advice.
Set up a openvpn server and VPN to your home abc then SSH from inside the network
I often see this parroted but it's not necessarily true. Properly configured and hardened SSH on an up-to-date system is, for all practical purposes, perfectly secure, even if it's facing the Internet.
I still only allow VPN inside my home network, but all my VPSs and dedicated servers (personal and work) have SSH facing the world. VPN is nice to have but not mandatory for this. Hardening SSH servers [1] must be done in all cases, even on "trusted" networks (there is no such thing as a fully trusted network).
Why would you even leave that vector for attack open if you didn't need to?
Seems unnecessary.
@Lateralking
A VPN is an attack vector, too, and as @vegetaaaaaaa said, it's not like you can slouch on hardening ssh regardless of where it listens.
It also adds complexity. One more thing to go wrong.
Do what you like, of course. Your devices, your choice.
@selfhosted