cddt:

 

FYI relatively recently the official pi OS removed the ability to configure the SD card to enable ssh on first boot. You now have to set up with attached peripherals, enable ssh, then you can log in remotely. This also means the thousands of "guides" on the internet are now not applicable. 

 

Re private/public key, it's worth having a read of the general concepts. 

 

Cheers.  Can you recommend a good source of info on SSH?

Edit:  Found a good reference and got it working 🥳