Just switched to google fiber and do not know how to get rachio 2 to connect
Assuming that you set up the new router with the same SSID (network name) and password as the old, and your other devices reconnected without needing any setup: Reboot the Rachio by removing power for a few seconds and power it on again. If it doesn’t come up, what do the light codes show?
OTOH, if you decided that this was a good time to change your SSID and/or password, see
If you already did that and are still having trouble, describe in detail what you have done, what device(s) you used, and what went wrong.