Quick answer
Pride's only reliable product is a fight. The alternative in the second line is not humility as a mood but the practice of taking counsel.
Read both lines
"Nothing but" is the strong claim. Pride may produce other things incidentally, but strife is what it manufactures, and the verse treats that as the giveaway: where there is a fight that did not need to happen, look for someone who could not be told anything. The second line's answer is concrete rather than attitudinal. The well-advised are simply people who take advice, which is the same remedy 11:14 prescribed for a nation and 12:15 for a fool, and this book keeps pointing at it because it is available to anyone willing to be corrected.
Related: Proverbs 11:2 · Proverbs 11:14 · Proverbs 12:15
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.