This was actually a very good explanation of Baluns and Chokes.

You’ve heard a lot of people recommend putting a few loops of coax near the feed point of your antenna to keep the RF energy out. How does this work and why is it needed. Watch this episode for more information on common mode currents, baluns, and RF chokes.

More info: https://www.jpole-antenna.com/2015/07/23/baluns-and-rf-chokes-ham-radio-q-a-episode-3/