Effective Communication Skills ... to avoid conflict at every level!
Such skills are essential for personal, work, right up to international relationships.
For me these would include:
sincere, clear and concise but kind words – written and spoken;
active listening, as in actually hearing what others say and clarifying to be very sure;
ability to negotiate win-win outcomes for all, this often means a degree of ‘compromise’ for all parties;
ability to reason logically, to collaborate and network with others
I believe that lack of such skills can complicate and often are responsible for conflict from arguments and divorce right up to wars.