Normal maintenance, Oil changes are super simple, rotate tires every 5-7k. Not much else to do with these things. The batteries have a 10yr 100k warranty (I believe) so just drive the thing and enjoy it. Keep a copy of all maintenance and youll be good.
I did just find this though:
https://www.driverside.com/service-schedule/complete/kia-niro-2018-2080282-5600136-0
I did just find this though:
https://www.driverside.com/service-schedule/complete/kia-niro-2018-2080282-5600136-0