How to setup multiple home wifi networks

I would like to have several separate networks setup in a wireless router. I envision a ‘public’ network for guests with cell phones, Alexa/Home devices which must connect to the internet. I also want to have most of my home automation devices in a network which does not have access to the internet, such as IP cameras, thermostats, etc. I would also like a separate network that handles security devices and which also does not have direct access to the internet.

I am pretty sure some wireless routers can do this. Due to the area needed for coverage I will need to ‘extend’ the wifi coverage of these networks. Can a single WAP handle more than one network per band? Would I need to buy a WAP per network needing more coverage.

Thanks for any advice or shared experiences.

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