I'm setting up a home network with multiple IoT devices and need to ensure they're secure from external threats. What are the key steps to configure a router firewall and segment the network properly?

I've recently added smart lights, a thermostat, and a security camera to my home network. I've heard that IoT devices can be vulnerable, so I want to isolate them from my main devices like laptops and phones. I've tried enabling the basic firewall on my router, but I'm not sure if it's enough or how to create separate network segments. Any advice on specific settings or tools would be helpful.