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I just wanted to add one permission to users (Sales(standard__LightningService)
the current approach is to create a permission set and assigned connected app to PS.is this good for only one permission to create permissions set or is there any other way to do it
Permission set gives extra permission to user if that permission is missing at the profile level.
So if your implementation requires to give a permission to a particular user instead of all users belongs to a profile then permission set is the best approach.
Yes your approach is correct.
Permission Sets are usually used for that very reason i.e. to extend user's access without changing their profiles.
When to use Profiles
then you can clone the existing profile and add that additional permission in new profile and assign this cloned profile to the required users. Although this can be achieved using permission set as well, but it is always better to have seperate profiles for two completely different sets of users which may require different permissions in future.
When to use Permission Sets
Permission Sets are useful when you want to extend the access to users in addition to the permissions provided by their profiles.
If this additional permissions needs to be provided for very less number of users
