In this lesson we create a Permission Set that extends the ability to delete cases to those users that are assigned to it.
I also explain how items that are unchecked on a Permission Set do not take away or further restrict a user's access and rights.
Permission Sets are used to extend further access and rights to Salesforce users and doesn't take away a user's existing rights that they have available to them by way of their Profile and corresponding settings.
Resources: Muting Permission Set - https://help.salesforce.com/articleView?err=1&id=perm_set_groups_muting.htm&type=5
Add Permission Sets to a Permiission Set Group - https://help.salesforce.com/articleView?err=1&id=perm_set_groups_create_with_perm_sets.htm&type=5