Raspberry Pi recommendations to improve code skill

Any Raspberry Pi will do you. A Pi Zero is very small but this doesn't limit it's functionality. The latest is the Pi 4. Model A and B versions can be picked up cheap on eBay.

Main consideration is a good power supply. A standard phone charger fits all except the new pi 4, that's USB C, but you need at least 2amps output.

I run my Pi's "headless" That is I set them up initially connected to a keyboard mouse and screen with a wifi dongle - set a static ip address - then use SSH and VNC viewer to connect to the PI from my PC.

thanks very much - ill look up those models.

jollyjohn - does this model seem ok? click here

thanks

Yes that looks OK but I have never bothered with a cooling fan on any of my Pi's

thanks again