Jocko Willink's YouTube video discusses effective disagreement resolution in leadership. He emphasizes the importance of thorough discussion ("not leaving the tent") before making decisions, even if it means challenging one's own preconceived notions. Willink uses the example of the Battle of Gettysburg to illustrate the negative consequences of prematurely ending discussions. The core principle is to prioritize understanding the other party's perspective rather than winning an argument, thereby fostering collaboration and effective solutions. This approach involves actively seeking to understand where the other person is coming from before disagreeing or challenging their ideas.