One of the videos I go over the most with my clients is Celeste Headlee's TED talk "10 ways to have a better conversation". The reason behind it is that instead of getting too theoretical about what to do, and what not do, in order to have a great conversation, she gets down and dirty from the start and gives very clear and actionable advice; all super useful and super entertaining -- just the way I like it in own my sessions. 

Now, there's so much beautifully helpful material here, that it would take many blog posts to unpack (and I might just do that!), but for now, watch out specifically for Rule 9: "Listen". As she herself mentions, it's by far the most important, and the one most of us have the hardest time dealing with. Absolutely one of my favorites, I love this woman!