Fiori authorization concept

I am trying to understand the authorization concept of SAP Fiori and i would be thankful if anyone can help here

- In each app i see things like business catalog role, business catalog group, business role, technical role and technical catalog

I am failing to understand what's their purpose exactly, let's for example select the Check Price and Availability App

App Implementation: Check Price and Availability - SAP Fiori Apps for Lower Back-End Releases - SAP Library

It list SAP_SD_PRAV_MON_APP as a backend authorization role and SAP_SD_BCR_FIELDSALESREP_X1 as the frontend authorization role. So if i assign just those two to my fiori user should this be enough? 

Do i need to assign:

1) Technical Role

2) Business catalog

3) Technical Catalog

4) Business catalog group

And one last thing, i need a backend standard ABAP role for SD for example, right?

Thank you in advance