Welcome to Hubitat.
In order to get notifications, you must have a device previously set up that supports notifications.
- Audio notifications: Perhaps the easiest of all notifications is the audio notifications to Sonos devices, using the built in driver/app. Audio notifications to alexa & google home devices also work, but usually require a 3rd party add on.
- Text notifications. This can be done via a variety of ways.
a) Twillio - low cost 3rd party add on
b) standard Linux SendMail on a RPI (this is what I use from @erktrek)
Email Notifications Driver using Node/sendmail on a PI
c) SendMail on the Hubitat (see SendMail from @kahn-hubitat) ; usually requires a email address on a local provider
Sendmail - Send email and text notifications, (notification device) no local server needed
d) Pushover driver
e) In order to get notifications to the Hubitat mobile app, the mobile app should setup a device for you - use that device to send notifications
I think that should get you started on the road that is most appropriate for you.