Hello,
You should know that as a content creator you are paid for the articles you write on Hive.
Whenever you assign a beneficiary, you are stating that you'd like this certain account to benefit from this post you've created. Eg. x% of the earnings shall be given to this account z.
Hopefully that was clear.
:)
id there any benefit for using the beneficiary
It benefits whoever you set it to. Not the original author.