Read Firebase data using Angularfire2

Hi,

I am a beginner in Ionic2 and AngularFire2. I am building a multipage project to display data from Firebase.
It can be done easily by using AngularFire module with af.database.* but I checked in few websites that using AngularFire module on every page is not recommended. Instead, we should Services to fetch data.
I am not able to get any proper tutorial or information regarding how to use Services.
Could anyone please point me in the right direction.

Thanks.

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