Domain Authority vs Sub-domain Authority earn by blogging adsense income

Is there any difference between Authority of a Domain & a Sub-domain, because I am Using my sub-domain (https://blog.expython.com) for Blogging which is a sub-domain of my Website (https://www.expython.com)

Do I have to create Seperate Backlinks for this?

Please Suggest me about it.

submitted by /u/exPYTHON
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