Garmin Edge Explore 820 help


I just got a Garmin Edge Explore 820 and have some questions. Didn’t have much time to play with it due to the weather. Yes, I downloaded and used the maps from

How do I make the trails routable for when I go to new parks?

I know about to get Strava segments onto the Garmin- I do not have a premium account.
How to I have it notify me when approaching a Strava segment and track the +/- time?
I heard that you can’t be routing if you want the Strava notifications.

Can you have it alert you to multiple segments on a ride? Can they overlap?