Before I had children I didn't know how to act around them. I remember thinking more than once, "What do I say to this kid?" Then when I had a couple of my own it became, "How do I shut this kid up?" Politely…of course. There is a lot of wiggle room between those two extremes. Luckily, as a parent, you have had experience with your own children, as well as with other parent's kids. You discover different ways to engage each child based on their interests, experiences, and location. This is very similar to engaging with an audience. Every audience is different. They have their own interests, experiences, and venues. Being able to engage different people in different ways is important for being a successful speaker.