Unfortunately thats very vague.
If you want as a doorbell only then 1080 resolution should be fine.
If it’s exposed make sure it’s ip rated for the weather.
Avoid PIRs if it’s very sunny as the lens covers can crack due to UV exposure.
hardwired for power is probably better than plain battery powered as you will be charging up every few months.
Then it’s cloud storage, sd card storage or recording to an NVR.
a few door bells are up to 5MP and dual band WiFi.