@zm Home networking continues to become more complex. It's generally a good idea to keep the same SSID and Wifi password for the new router so that, if you have 50 devices or so on your network, you don't have to manually connect them all to the new router. It can be difficult enough to setup the new router hardware. By reusing the same SSID and Wifi password on the new router, all your devices should automatically log into the new router.
I upgraded my router within the last couple weeks, and I had to hard reset one of my smart displays because nothing else worked.