Most of us debate poorly.  There are a number of factors like not knowing what we believe as well as we should, presenting a caricature of an opposing position, and even if we don’t err with those two, we tend to get testy!  My number one resource for making improvement is The Righteous Mind: Why Good People are Divided by Politics and Religion by Jonathan Haidt.  I wish every American would read and ponder this seminal book.

https://www.amazon.com/Righteous-Mind-Divided-Politics-Religion/dp/0307455777

Here’s a good example of how to do better: