Deferred Sharing Calculation : Best fit if you can buy out maintenance window from live user.If Salesforce perform any activity, these jobs will not be killed and resume after salesforce activity.
This will split the job in multiple threads which will run asynchronously. In order to avoid this, consider enabling parallel Sharing Rule calculation.
Parallel Sharing rule calculation: If Salesforce perform any activity (maintenance or upgrade) then all sharing recalculation jobs get killed. 
This allow multiple update simultaneously if there is no hierarchical or other relationship between the roles and groups involved in the update. If Granular locking feature is enabled then system will lock portion of records instead of locking entire Group maintenance table. This will make impossible to perform group membership changes during this lock period.
Granular locking: Usually group membership get locked if any configuration happens. Public groups (who all can be added and how access can be restricted to higher role using public groups). Always remember that External default sharing level of object should be equal to or less restrictive than internal default sharing level. Also cover different types on file and folder access permissions. Reports and dashboard folder access and permission required to manage this. Record Access Grants(Implicit grant, Group membership grant, Inherited grant and explicit grant). Differences between shield and classic encryption. Always remember that manual sharing of record or manual sharing created through apex get deleted when record owner changes. Ownership Skew, Lookup Skew and Account Skew and their impact on performance. 
Custom settings, named Credentials and Custom metadata. Permission required for creating list views and with whom all list view can be shared. 
Different scenarios like who all can add team members, who can change record owner, what level of access can be given to user considering object OWD setting etc.
Must do practice on Account Teams and Opportunities. Important topics are difference between Territory management(1.0) and Enterprise Territory Management (2.0) and their capabilities. As I was not able to do practice on Territories, I just went through Salesforce help section for territories. Custom permissions, Profiles and permission sets. Candidate must have complete understanding of different record sharing in built functionality like OWD, Role Hierarchy, Sharing Rules, Manual Sharing, Teams, Territories etc.
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