How to enable SSH server?

[Baggypants]

I have always installed sshd on the pinephone.

But then it struck me ...
When on GSM-Data , would the ssh port be fully exposed to "anyone" on the internet ?
If yes then iptables or ufw would be a good thing to install/activate.

Or at least switch off passwd logins , and only allow ssh key logins
Keys would not be a problem for me , i'm only ssh'ing for 2 machines to the PP

/Bingo

Essentially  the answer to all of these is yes.