Where I learned to explain
Before any cluster, I spent 14 years at a big retail chain, from the sales floor to after-sales manager. I sold TVs and explained them to people who only wanted them to work.
I spent hours on that floor talking to strangers, learning to listen and to explain. I had no idea those years would help me so much later, from demos for one customer at Red Hat to talks for full rooms at conferences. Life has a funny way of preparing you for things you can't see yet.