New wifi router

Can someone please tell me what will happen (or what I will have to do) when I replace my 5 year old wifi router? What will I have to do as far as smartthings is concerned? I’m using a V2 hub with roughly 120 devices. Thanks.

Nothing to SmartThings specifically. The v2 HUB connects via wired connection and the things it cares about are Zigbee and ZWave. You may have other Wi-Fi endpoint devices you have to reconfigure if you switch WiFi SSIDs or authentication levels… Otherwise… No.