In a domain authority stacking strategy, high authority 3rd party platforms are used to assist ranking and as a buffer to protect your money site against backlink spam. A full understanding of Domain Authority Stacking will allow you to safely and effectively use potentially harmful backlink automation systems such as Magic Submitter, GSA, Link Emperor, SE Nuke, and pretty much any other backlink system you could buy or build.
Jimmy Kelley has many such methods in his arsenal, Domain Authority
Stacking is one of the most powerful and easy to learn during for anyone
willing to take the time.